(t² + 3t³ - 3) + (2t² + 7t - 2t³) =
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Answer:
(t²+3t³-3)+(2t²+7t-2t³)
=t²+3t³-3+2t²+7t-2t³
=t²+2t²+3t³-2t³-3t+7t
=4t²+t³+4t
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