algebra

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subtract
(5a^3+a-7)-(8-7a^3-2a^2)

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(5a^3+a-7)-(8-7a^3-2a^2)
Distribute the negative to the ride side that's in parentheses.
(5a^3+a-7)-8+7a^3+2a^2
Combine like terms.
12a^3+2a^2+a-15

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