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