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=x^2+2x^3
2. 7a(1+b)-3b(1+a)
=7a+7ab-3b-3ab
=7a+5ab-3b
9x² -8x² +7x³ -5x³
x² +2x³
2. 7a(1 +b) -3b(1 +a)
7a +7ab -3b -3ab
7a +7ab -3ab -3b
7a +4ab -3b