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2x-3x-15 = 2x-x-3
2x-3x-2x+x = -3+15
-3x+x = 12
-2x = 12
x = 12/-2
x = -6
b) 5x - 3(2x-6) -3(x+2) = 2x - 6
5x-6x+18-3x-6 = 2x-6
5x-6x-3x-2x = -6-18+6
-x-5x = -18
-6x = -18
x = -18/-6
x = 3