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m in (-oo:+oo)
-2 = 2*m+4/(-5) // - 2*m+4/(-5)
-(2*m)-(4/(-5))-2 = 0
4/5-2*m-2 = 0
-2*m-6/5 = 0 // + 6/5
-2*m = 6/5 // : -2
m = 6/5/(-2)
m = -3/5
m = -3/5
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