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2. 6a-b+17
3. -6 x²+16xy+10 y²
b. (11a-7b+8)-(5a-6b-9) = 11a-5a-7b+8b+8+9 = 6a+b+17
c. (5x"-10xy-7y")-(-x"+6xy+3y") = 5x"+x"-10xy-6xy-7y"-3y" = 6x"-16xy-10y"