7x-6-8x+12=-3x+9
-x+3x=9-6
2x=3
x=3/2
-3+2-7=4x-15-8x
-8+15=-4x
4x=7
x=7/4打错了。。。-3+2x-7=4x-15-8x 可不可以把过程写清楚？-3+2x-7=4x-15-8x -10+2x=-4x-152x+4x=-15+106x=-5x=-5/6