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-3x=15
x=15/-3
x=-5
2)10x-7=8-5x
10x+5x=8+7
15x=15
x=15/15
x=1
3)12x-24-7x+6=-2x+12+4x
5x-18=2x+12
5x-2x=12+18
3x=30
x=30/3
x=10
4)-9x+18+6+6x=7x-6x-8
-3x+24=x-8
-3x-x=-8-24
-4x=-32
x=-32/-4
x=8