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=ab+ac+4b+4c
12) a(m-n)-b(m-n)
=am-an-bm+bn
13)2a(a-b)-b(a-b)
=2a^-2ab-ab+b^
=2a^+b^-3ab
14)3x(2x+5)-7(2x+5)
=6x^+15x-14x-35
=6x^+x-35
15)5x(x-3y)+2y(x-3y)
=5x^-15xy+2xy-6y^
=5x^-6y^-13xy
semoga dapat membantu