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m in (-oo:+oo)
(1/5)*(m+7) = 25 // - 25
(1/5)*(m+7)-25 = 0
1/5*(m+7)-25 = 0
1/5*(m+7)-25 = 0
1/5*m-118/5 = 0
1/5*m-118/5 = 0
1/5*m-118/5 = 0 // + 118/5
1/5*m = 118/5 // : 1/5
m = 118/5/1/5
m = 118
m = 118
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