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m in (-oo:+oo)
(1/5)*m-4 = (2/5)*m // - (2/5)*m
(1/5)*m-((2/5)*m)-4 = 0
(1/5)*m+(-2/5)*m-4 = 0
-1/5*m-4 = 0 // + 4
-1/5*m = 4 // : -1/5
m = 4/(-1/5)
m = -20
m = -20
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