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m in (-oo:+oo)
7-(6*m) = 5*m-114 // - 5*m-114
7-(6*m)-(5*m)+114 = 0
7-6*m-5*m+114 = 0
121-11*m = 0 // - 121
-11*m = -121 // : -11
m = -121/(-11)
m = 11
m = 11
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