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