Subtract 4a- 7ab+3b +12 from 12a -9ab+ 5b-3
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(12a-9ab+5b-3)-(4a-7ab+3b+12)
=12a-9ab+5b-3-4a+7ab-3b-12 Rearranging the terms,
=12a-4a-9ab+7ab+5b-3b-3-12
=8a-2ab+2b-15
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