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