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m in (-oo:+oo)
5-2*m = 4*m-67 // - 4*m-67
5-2*m-(4*m)+67 = 0
5-2*m-4*m+67 = 0
72-6*m = 0 // - 72
-6*m = -72 // : -6
m = -72/(-6)
m = 12
m = 12
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