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[2*(m + 5) - 15*(m - 3)]/ (m - 3)*(m + 5)
(3m - 9 - 16m + 64)/(m - 4)* (m - 3)
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(2m + 10 - 15m + 45)/(m - 3) * (m + 5)
(55 - 13m) * (m + 5)
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(55 - 13m) * (m - 4)
m + 5
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m - 4