（82899-2.5X）*11.4/22.4*0.9=19390+9X
    （82899-2.5X）*11.4/22.4*0.9=19390+10X
    4a+2=0
    x/(x^2+1)
    (a-20)(-2a+80)=150
    1/2x*x-1/2x-45=0
    1.2x*x-1.2x-45=0
    （1.01+1.88x）*55+2490x=223.86
    x(x-1)/2=45
    x/72+0.35x/72+0.35x*1.4/36=50
    x²+5x-2250=
    x(35-x)=640
    12=（44+x)/24+0.4x/18
    12=（44+x)/24+(1.4x*1.4)/18
    12=（44+x)/24+(x-0.4x*1.4)/18
    12=（44+x)/24+(0.4x*1.4)/18
    -0.5x^2+35x=640
    x²-12x+28=0
    x(30-2x)=100
    X(33-x)+20x

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