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Mathematics, 24.09.2020 01:01 083055

(8r^2-7r-9) +(-r^2+r)=(8r 2 −7r−9)+(−r 2 +r)

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(8r^2-7r-9) +(-r^2+r)=(8r 2 −7r−9)+(−r 2 +r)...

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