50000=(100-x)*1800-50000
    X+X^2=0.04
    X+X^2=0.04
    2(x-3)-3(x+5)=5-2x
    -x+9=5-2x
    (x+1)-(2x-5)=2x-3
    2(2x-1)=3(x+2)-(x+6)
    （26.493+x）×0.85＝26.493+70.278-x
    （26.493+x）×0.85＝26.493+71.278-x
    （26.493+x）×0.85＝26.493+72.278-x
    （26.493+x）×0.85＝26.493+73.278-x
    4x+5-3x=8-2x
    7x+3=4x+6
    3x+7=32-2x
    1.2-0.9+5x=0.8
    7(x-6)=2x
    7+x-2(x-1)=1
    2(x-2)+2=x+1
    (5y+1)+(1-y)=(9y+1)+(1-3y)
    17+X/22+X=95%

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