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m in (-oo:+oo)
2*m-5*m-(1/2) = 1/2 // - 1/2
2*m-5*m-(1/2)-(1/2) = 0
2*m-5*m-1/2-1/2 = 0
-3*m-1 = 0 // + 1
-3*m = 1 // : -3
m = 1/(-3)
m = -1/3
m = -1/3
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