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m in (-oo:+oo)
79 = 2*m+6*m-9 // - 2*m+6*m-9
9-(2*m)-(6*m)+79 = 0
9-2*m-6*m+79 = 0
88-8*m = 0 // - 88
-8*m = -88 // : -8
m = -88/(-8)
m = 11
m = 11
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