10X-6X=9.6
    8X-3X=15.6
    9X-14*5.5=58
    (27.5-3.5)/X=4
    3X+1.2=7.2*0.5
    13.2X+9X=33.3
    0.1(X+6)=3.3*0.4
    10.5+X+21=56
    1.4*8-2X=6
    3.5X-0.8X=11.34
    13/X=0.4
    5.5X+6.7=7.8
    4X-7+7=23+7
    x÷(16-x)＝√3
    2.8X+3.6=20
    X-2.99=18.2
    16-2（x/3）=0.4
    3x^2-20x=-20
    y^2+y=3660
    ex＝-x

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