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m in (-oo:+oo)
-11/5 = m+(1/2)*m+4/5 // - m+(1/2)*m+4/5
-m-((1/2)*m)-11/5-(4/5) = 0
(-1/2)*m-m-11/5-4/5 = 0
-3/2*m-3 = 0 // + 3
-3/2*m = 3 // : -3/2
m = 3/(-3/2)
m = -2
m = -2
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