Given that 1:1 a minus 1:1 B = 3, find 2A + 3ab-2b of a-ab-b

1/a-1/b=3
Multiply both sides by ab
b-a=3ab
a-b=-3ab
a-ab-b
=a-b-ab
=-3ab-ab
=-4ab
2a+3ab-2b
=2(a-b)+3ab
=-6ab+3ab
=-3ab

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