5X+2=7X+8 X=?.

问题描述:

5X+2=7X+8 X=?
.

5x+2=15x
-10x=-2
x=0.2

5X=7X+8-2
5X=7X+6
5X-7X=6
-2X=6
X=-3

5X+2=7X+8X
5X+2=15X
2=10X
X=0.2

x=-3