3x+5x=16-7x
    2tana=tana+1
    2tana=tana+1
    2tana/(1-tana)^2=-4*(tana+1/1-tana)
    20-9X=1.2*6.25
    0.1(X+6)=3.3*0.4
    15.6/4-3.5X=1.1
    (0.5+1)+X=9.8/2
    5x-4*12=22.5
    (27.5-3.5)÷X=4
    20-9X=1.2*6.25
    14X/3=6.3*4
    15.6/4-3.5X=1.1
    0.1(X+6)=3.3*0.4
    (X-140)/70=4
    7*0.3+4X=12.5
    x(7-x)＝6
    (X-9)/(98-9X)=4
    1.3X+2.4*3=12.4
    6X-12.8*3=0.06

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