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m in (-oo:+oo)
2*m-1 = 4*m-(7/2) // - 4*m-(7/2)
2*m-(4*m)+7/2-1 = 0
2*m-4*m+7/2-1 = 0
5/2-2*m = 0 // - 5/2
-2*m = -5/2 // : -2
m = -5/2/(-2)
m = 5/4
m = 5/4
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