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m in (-oo:+oo)
-15 = 6*m+m+6 // - 6*m+m+6
-(6*m)-m-15-6 = 0
-6*m-m-15-6 = 0
-7*m-21 = 0 // + 21
-7*m = 21 // : -7
m = 21/(-7)
m = -3
m = -3
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