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m in (-oo:+oo)
5*m+7 = 6*m+13 // - 6*m+13
5*m-(6*m)-13+7 = 0
5*m-6*m-13+7 = 0
-m-6 = 0 // + 6
-m = 6 // * -1
m = -6
m = -6
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