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m in (-oo:+oo)
5-(6*m)-m = -9 // + 9
5-(6*m)-m+9 = 0
5-6*m-m+9 = 0
14-7*m = 0 // - 14
-7*m = -14 // : -7
m = -14/(-7)
m = 2
m = 2
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