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-13x=15
x=15/-3
x=-5
2) 6x + 4x + 5x = 8+ 7
15x=15
x=15/15
x=1
3)12x-24-7x+6= -2x + 12 + 4x
5x-18=6x+12
5x-6x=12+18
-x=30
x=-30
4)-9x+18+6+6x=7x-6x-8
-3x+24=x-8
-3x-x=-8-24
-4x=-32
x=-32/-4
x=8
^_^
-3x=19 - 4
x=15/-3
x=-5
2) 6x-7+4x=8-5x
6x+4x+5x=8+7
15x=15
x=15/15
x=1
3) 4(3x-6)-7x+6=-2(x-6)+4x
12x-24-7x+6=-2x+12+4x
12x-7x+2x-4x=12+24-6
3x=30
x=30/3
x=10
4)-9(x-2)+6+6x=7x-2(3x+4)
-9x+18+6+6x=7x-6-8
-9x+6x-7x=-6-8-18-6
-10x=-38
x=-38/-10
x=3,8