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