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m in (-oo:+oo)
-7*m-9 = -(5*m)-5 // + -(5*m)-5
5*m-7*m-9+5 = 0
-2*m-4 = 0 // + 4
-2*m = 4 // : -2
m = 4/(-2)
m = -2
m = -2
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