200000-x=20%x
    200000-X=200000-X*20%
    0.7305^2=2/x-2/x^2*(1-e^(-x))
    x=-lnx
    244＝275×（1－x）
    122＝275×（1－x%）÷2
    20%X+X=12000
    30%X+X=12000
    20%X+X=12000
    20%X=12000
    20%X
    20%x+x=1200
    arctantan2x
    20%*X=12000-X
    12000－x＝20％x
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x))=1
    2X=1
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1
    0.049*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1

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