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-4a² + a -
7a² - 5a
b. 3a² - 6
4a² -7 -
-a² + 1
c. x² + 3 +2 = x² + 5
4x² + 2 -7= 4x² -5 -
- 3x² + 10
d. 3x³ + 5x² - 2x
-2x³ - 4x² + 6x -
5x³ + 9x² - 8x