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= 2x - x + 5 + 3
= x + 8
b. x² + 4x - 1 - 2x² - 4x
= x² - 2x² + 4x - 4x -1
= -x² - 1
c. y² - 3 - 4y² - 5y - 6
= y² - 4y² - 5y - 3 - 6
= -3y² - 5y - 9
d. 5a - 6 + ab - a - 2ab + 1
= 5a - a + ab - 2ab - 6 + 1
= 4a - ab - 5
b
c
d