Mathematics, 28.12.2019 12:31 holaadios222lol

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). i don't understand what i'm doing wrong.

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Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). i don't understand what i'm doing wrong....

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