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m in (-oo:+oo)
-109 = 8-6*m-(7*m) // - 8-6*m-(7*m)
7*m-(-6*m)-109-8 = 0
6*m+7*m-109-8 = 0
13*m-117 = 0 // + 117
13*m = 117 // : 13
m = 117/13
m = 9
m = 9
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