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m in (-oo:+oo)
5/2 = m/4 // - m/4
5/2-(m/4) = 0
5/2-1/4*m = 0 // - 5/2
-1/4*m = -5/2 // : -1/4
m = -5/2/(-1/4)
m = 10
m = 10
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