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Question
Simplify combining like terms: - z2 + 13z2 − 5z + 7z3 − 15z
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Solution
− z2 + 13z2 − 5z + 7z3 − 15z = 7z3 − z2 + 13z2 − 5z − 15z
= 7z3 + z2 (−1 + 13) + z (−5 − 15)
= 7z3 + 12z2 − 20z
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