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= 4x - 2y + 7
b. 4x^2 + 2x^2 - 2x^2 - 3x^3 + 5
= 4x^2 - 3x^3 + 5
c. 3ab - 2ab - 5bc - 4bc
= 1ab - 9bc
d. 3x^2 + 2xy + 6y - 8y + 4x^3
= 3x^2 + 2xy - 2y + 4x^3