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m in (-oo:+oo)
1-m-(6*m) = 15 // - 15
1-m-(6*m)-15 = 0
1-m-6*m-15 = 0
-7*m-14 = 0 // + 14
-7*m = 14 // : -7
m = 14/(-7)
m = -2
m = -2
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