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5. (m^2-m-3)+(m-4)A. m^2+m-1 B. m^2+2m-7 C. m^2-7 D. m^2-1 6. (4x^2-2x-1)-(-3x^3+2) A. -3x^3+4x^2-2x+1 B. -3x^3+4x^2-2x-3 C.
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