6a-2b-ab-(3a+b+ab)+2ab-b-a
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6a - 2b - ab- ( 3a + b + ab ) + 2ab -b - a
= 6a - 2b - ab - 3a - b - ab + 2ab - b - a
=6a - 3a - a + 2ab - ab - ab - 2b - b- b
= 2a - 4b
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