2.398*(1-x^10)/(1-x)=99.97
    0.67*(1-x^10)/(1-x)=99.97
    267.5*(1-x^10)/(1-x)=4270
    1.58*(1-x^10)/(1-x)=43.96
    t=1-4*6/7
    t=3*6/7-5
    1-4x=3x-5
    11.9*(1-x^11)/(1-x)-11.9=436.95616
    597*(1-x^11)/(1-x)-597=7858.19
    -2x^3-x^2+9x=9
    x*72*cos(20.78) + (sqrt(x) - sqrt(72))/(1 - 0.015*sqrt(72*x)) = x
    7y-(27-3y)=(27-3y)-2
    0.05X+X*2＝0.63（0.35-X）
    0.05X+X*2＝0.625（0.35-X）
    X*2+0.675X-0.21875＝0
    0.075-0.55X+X*2＝0.063+0.63X
    sin(x)*cos(x)/√(2.25-sin(x))-sin(x)=1/3000
    sin(x)*cos(x)/√(2.25-sin(x))-sin(x)=1/3000
    sin(x)*cos(x)/√(2.25-sin(x))-sin(x)=1/3000
    60%=1000/x

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