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12) am-an-bm+bn
13) 2a²-2ab-ab+b²
14) 6x²+15x-14x-35
15) 5x²-15xy+2xy-6y²
16) 9b²+3ab+12bc
17) a²b²+a²b-abc
18) -p²q+pq²r+p²
19) -16p³r-12p²q-24p²
20)-10xy⁴+20x³y²z+15x²y³
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