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b.5x^2- 8x^2= -3x^2
c. 2x^2 -5x^2+ 7x - x+5
= - 3x^2 + 6x + 5
d. 3x^2 -2y +3-7x^2 + 2x + y
= - 4x^2 + 2x - y+ 3
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