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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 -3b
2. 9x² + 7x³ - 8x² -5x³ = x² +2x³
3. 7a(1+b) - 3b(1+a) = 7a + 7ab - 3b - 3ab
= 7a - 3b + 4ab
4. 3b - bx / cx - 3c = b(3 - x) / c(x - 3)
= 3b - bx / cx - 3c (tetap)