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m in (-oo:+oo)
5-2*m = 5*m-72 // - 5*m-72
5-2*m-(5*m)+72 = 0
5-2*m-5*m+72 = 0
77-7*m = 0 // - 77
-7*m = -77 // : -7
m = -77/(-7)
m = 11
m = 11
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