Question: Simplify by combining like terms. ( 7 r s - 9 r 7 s - 1 2 r s 7 ) - ( 1 2

Simplify by combining like terms.
(7rs-9r7s-12rs7)-(12rs7-9rs+7r7s)
Simplify by combining like terms. (7rs-9r7s-12rs7)-(12rs7-9rs+7r7s)

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