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m in (-oo:+oo)
(1/5)*m-m+3/5 = -1/15 // + -1/15
(1/5)*m-m+3/5-(-1/15) = 0
(1/5)*m-m+3/5+1/15 = 0
2/3-4/5*m = 0 // - 2/3
-4/5*m = -2/3 // : -4/5
m = -2/3/(-4/5)
m = 5/6
m = 5/6
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