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m in (-oo:+oo)
-(2*m)-(5*m)-9 = -65 // + 65
65-(2*m)-(5*m)-9 = 0
65-2*m-5*m-9 = 0
56-7*m = 0 // - 56
-7*m = -56 // : -7
m = -56/(-7)
m = 8
m = 8
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