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m in (-oo:+oo)
-2/5 = (-1/3)*m+2/5 // - (-1/3)*m+2/5
-((-1/3)*m)-2/5-(2/5) = 0
(1/3)*m-2/5-2/5 = 0
1/3*m-4/5 = 0 // + 4/5
1/3*m = 4/5 // : 1/3
m = 4/5/1/3
m = 12/5
m = 12/5
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