40%x=4.

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40%x=4.
40%x=4.

40%x=4.
40%x=4.2
0.4x=4.2
x=4.2/0.4
x=10.5

4.2÷0.4=10.5

0.4=40%
0.4 X x=4.2
x=10.5

0.4x=4.2
x=4.2/0.4
x=10.5

40%x=4.2
x=4.2/0.4
x=10.5

x=4.2/40%
x=4.2/0.4
x=10.5

40%x=4.2
0.4x=4.2
x=4.2/0.4
x=10.5

x-40%x= 40%x=4. 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 1.6x=x+4. 10x=x+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