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m in (-oo:+oo)
-6*m-(3*m)-7 = -79 // + 79
79-6*m-(3*m)-7 = 0
79-6*m-3*m-7 = 0
72-9*m = 0 // - 72
-9*m = -72 // : -9
m = -72/(-9)
m = 8
m = 8
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