（40-40x）x+40x=40-32.4
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（40-40x）x+40x=40-32.4（40-40x）x+40x=40-32.4（40-40x）x+40x=40-32.440x-40x2+40x=7.840x2-80x+7.8=0
（40-40x）x+40x=40-32.4
（40-40x）x+40x=40-32.4
（40-40x）x+40x=40-32.4
40x-40x2+40x=7.8
40x2-80x+7.8=0
x-40%x=
x-40%x-40%x=15
x+40=2x x=?
X×X+(40-X)=58
X乘以X等于40 ---------------------X=?
10x+x*x=40
(x+40%x)×85%-x=95
(x+40%x)×85%-x=95
4x+x=40x
40%x+70%x-x=1.8
（40-40x）x+40x=40-32.4
X/(x-30)=(x+40)/X解方程,
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
x-40%x=24
X-40%X=360
x+40%x=28
X-40%X=120