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-12ab-6a2 - 8a2+10a2b
-12ab-14a2+10a2b
2. -2(x2+x-1) - 5(4a-5ab)
-2x2 - 2x +2 - 20a +10ab
3. 3b(5a2+4a-3b) - -4a(3a-2a2-b)
15a2b+12ab-9b2+4a+12a2+8a3+4ab
15a2b-9b2+4a+12a2+8a3+12ab+4ab
15a2b-9b2+4a+12a2+8a3+16ab