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