plz solve this equation
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sum of=
8a+3ab-2b+7 +(4a+5b-28ab-15)
=8a+4a+3ab-28ab-2b+5b+7-15
=12a-25ab+3b-8
difference of=
2a-4b+3ab+5-(3a+6b-9ab+12)
=2a-4b+3ab+5-3a-6b+9ab-12
=2a-3a-6b-4b+3ab+9ab+5-12
= -a-10b+12ab-7
subtraction=
-a-10b+12ab-7-(12a -25ab+3b-8)
=-a-10b+12ab-7-12a+25ab-3b+8
=-a-12a-10b-3b+12ab+25ab-7+8
=-13a-13b+37ab-1
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