Simplify the sum: (5u^3+7u^2+7) + (7u^3-6u+5)

A) 12u^3+7u^2-6u+12

B) - 2u^3+7u^2-6u+12

C) 12u^3+6u^2-7u+12

D) - 2u^3-6u^2+7u-12

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