100-100*e^((-(x/50)^1.1))=1
    100-100*e^((-(x/50)^1.1))=1
    100-100*exp(-(x/50)^1.1)=1
    450-x=x/0.75
    450-x=x/tan37
    x/50- x+120/50+6 ＝3
    50000=(x-50)*1800-50000
    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

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