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Simplify (9− r 2 ) r 2 −2 r −3 ·(4−4 r 2 ) r 2 +4 r +3 : −4(1− r ) r +1. Steps. 9− r 2 r 2 −2 r −3 ·4−4 r 2 r 2 +4 r +3 ...

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