x-40%=5.8
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x-40%=5.8
x-40%=5.8
x-40%=5.8
x-40%=5.8
x-40%+40%=5.8+40%
x=5.8+0.4
x=6.2
x-40%=5.8
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
x+ 5.8x=12
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