2x+5(30-x)=90
    2x+150-x=90
    x^(x^5)=100
    （440*55-x）*0.9+18*55=21010
    30000*(1+0.02)^x=100000000
    30000*（1+0.1）^x=100000000
    x=74600+0.0672x
    x=74500+0.0672x
    x=74100+0.0672x
    x=75100+0.0672x
    a^3-7a^2+14a-7=0
    x(12-2x)/2=6
    x(26-2x)=80
    x(28-x)=160
    x(12-2x)=16
    x(12-2x)/2=8
    x(12-2x)=8
    (32-x)(20-x)=540
    (12-2x)=81
    (40-2x)(25-2x)=450

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