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
    x+2=0
    50x－80×50－5×50－300＝0
    50x＝91×50－80×50－300
    50x＝91×50－5×50－300
    50x＝91×50+5×50+300
    50x＝80×50+5×50+300
    50x＝80×50+5×80+300
    200＝100×8-20×8-5×8-x

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