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m in (-oo:+oo)
-9 = 5*m-(2*m)+9 // - 5*m-(2*m)+9
2*m-(5*m)-9-9 = 0
2*m-5*m-9-9 = 0
-3*m-18 = 0 // + 18
-3*m = 18 // : -3
m = 18/(-3)
m = -6
m = -6
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