13.24c=（3.5+c）×7.98
    13.24c=（3.5+c）×7.96
    40000x－500×40000－50×40000－2000000＝0
    (8/5)*(5-4x)+(2/3)*(4x-5)=(-1/4)*(3x-5)-(9/5)*(5-3x)
    40000x－500×400000－50×40000－2000000＝0
    （x+8）/3=（x-9）/4
    a+1=0
    300x-120x-40x-2800000＝1000000
    50x－80×50-5×50-300＝0
    70.87+X*0.25=X
    30398.13+X*0.25 = X
    30398.13-X*0.0003+(X+X*0.0003)*0.25 = X
    （38-x）(160+120x)=3640
    1/1+x
    106b^3-121b^2-106b+96=0
    4x^3=3-x
    x*x+3x=4
    n-√n=2
    -93x^2-440x+2650=0
    （210-x）√3/3+10=x

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