Simplify 6t3 - 5t + 2u3 + 7t3 - 4u3 + 11t

A) t3 + 6u2 + 18t

B) t3 + 9u3 + 7t

C) 13t3 - 2u3 + 6t

D) 19t3 - 2u2

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