a) 8x + 5 - 2x - 7 = 8x - 2x + 5 - 7 = 6x - 2
b) -5ab - 3b + 7a - 2ab + b = -5ab - 2ab + 7a - 3b + b = -7ab + 7a - 2b
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a) 8x + 5 - 2x - 7 = 8x - 2x + 5 - 7 = 6x - 2
b) -5ab - 3b + 7a - 2ab + b = -5ab - 2ab + 7a - 3b + b = -7ab + 7a - 2b