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