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(2a+6a)+(7b-b) =8a+6b
2.5x+y-3x+6y-8
(5x-3x)+(6y+y)-8 = 2x+7y-8
3. 9a-5b-6+a-3b
(9a+a)+(-5b-3b)-6 = 10a-8b-6
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