3 a - 2b - ab - (a b+ab) + 3 ab + b-a
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Step-by-step explanation:
3a-2b-ab-(ab+ab)+3ab+b-a
=3a-2b-ab-ab-ab+3ab+b-a
=2a-b-ab-2ab+3ab
=2a-b-3ab+3ab
=2a-b
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