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= 4x - 12y - 6x + 12y = -2x
6x+5(2x-3)+8=
= 6x + 10x - 15 + 8 = 16x - 7
-5(2a+4)+(6a-8)+1=
= -10a - 20 + 6a - 8 + 1 = -4a - 27
6x + 5(2x - 3) + 8 = 6x + 10x - 15 + 8 = 16x - 7
-5(2a + 4) + (6a - 8) + 1 = -10a - 20 + 6a - 8 + 1 = -4a - 27