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On line solution of multivariate equations：
    First set the elements of the equation (i.e. the number of unknowns), then click the "Next" button to enter the coefficients of each element of the equation set, and click the "Next" button to obtain the solution of the equation set.
    Note that the coefficients of each element of the equation system can only be numbers, not algebraic expressions (including mathematical functions).
    Current location：Equations > Multivariate equations > Answer
detailed information：
The input equation set is:
 8x -1y -1z = 1    (1)
 26x + y -1z = 0    (2)
-1x -1y + 31z = 0    (3)
Question solving process:

Multiply both sides of equation (1) by 13
Divide the two sides of equation (1) by 4, the equation can be obtained:
         26x - 
13
4
y - 
13
4
z = 
13
4
    (4)
, then subtract both sides of equation (4) from both sides of equation (2), the equations are reduced to:
 8x -1y -1z = 1    (1)
 
17
4
y + 
9
4
z = - 
13
4
    (2)
-1x -1y + 31z = 0    (3)

Divide the two sides of equation (1) by 8, the equation can be obtained:
         x - 
1
8
y - 
1
8
z = 
1
8
    (5)
, then add the two sides of equation (5) to both sides of equation (3), the equations are reduced to:
 8x -1y -1z = 1    (1)
 
17
4
y + 
9
4
z = - 
13
4
    (2)
- 
9
8
y + 
247
8
z = 
1
8
    (3)

Multiply both sides of equation (2) by 9
Divide the two sides of equation (2) by 34, the equation can be obtained:
         
9
8
y + 
81
136
z = - 
117
136
    (6)
, then add the two sides of equation (6) to both sides of equation (3), the equations are reduced to:
 8x -1y -1z = 1    (1)
 
17
4
y + 
9
4
z = - 
13
4
    (2)
 
535
17
z = - 
25
34
    (3)

Multiply both sides of equation (3) by 153
Divide both sides of equation (3) by 2140, get the equation：
         
963
428
z = - 
45
856
    (7)
, then subtract both sides of equation (7) from both sides of equation (2), get the equation：
 8x -1y -1z = 1    (1)
 
17
4
y = - 
2737
856
    (2)
 
535
17
z = - 
25
34
    (3)

Multiply both sides of equation (3) by 17
Divide both sides of equation (3) by 535, get the equation：
         z = - 
5
214
    (8)
, then add the two sides of equation (8) to both sides of equation (1), get the equation：
 8x -1y = 
209
214
    (1)
 
17
4
y = - 
2737
856
    (2)
 
535
17
z = - 
25
34
    (3)

Multiply both sides of equation (2) by 4
Divide both sides of equation (2) by 17, get the equation：
         y = - 
161
214
    (9)
, then add the two sides of equation (9) to both sides of equation (1), get the equation：
 8x = 
2568
11449
    (1)
 
17
4
y = - 
2737
856
    (2)
 z = - 
5
214
    (3)

The coefficient of the unknown number is reduced to 1, and the equations are reduced to：
 x = 
321
11449
    (1)
 y = - 
161
214
    (2)
 z = - 
5
214
    (3)


Therefore, the solution of the equation set is:
x = 
321
11449
y = - 
161
214
z = - 
5
214


Convert the solution of the equation set to decimals:
x = 0.028037
y = -0.752336
z = -0.023364

解方程组的详细方法请参阅：《多元一次方程组的解法》
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