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m in (-oo:+oo)
-79 = 3*m+5*m+9 // - 3*m+5*m+9
-(3*m)-(5*m)-79-9 = 0
-3*m-5*m-79-9 = 0
-8*m-88 = 0 // + 88
-8*m = 88 // : -8
m = 88/(-8)
m = -11
m = -11
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