2n-17.2=0.4
    （y+14.2)/8=2.9
    (0.29/(350+x))*x = 0.14
    x/(x+3859.36)=1.04%
    8(y-2.2)=22.4
    y+14.2/8=2.9
    10/3y+31/5=131/5
    (0.29/(350+x))*x=0.14
    90%（y-2)=4.5
    10%x+120*30%=20%(120+x)
    (0.29/350+x)*x=0.14
    20.1x+3.6=24+x
    (290/350+x)x=0.14
    (0.29/350+x)x=0.14
    0.29x/350+x=0.14
    x^3-140*x^2+600*x-192000=0
    8/x+8/x^2+8/x^3+108/x^4=100
    x^3-140*x^2+600*x-19200=0
    (1+x)/(1+x+1+2.33)=0.3
    (1.5+y)/(1+2.33+1.5+y)=0.3

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