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m in (-oo:+oo)
(3/5)*m+1/3 = 11/15 // - 11/15
(3/5)*m+1/3-(11/15) = 0
(3/5)*m+1/3-11/15 = 0
3/5*m-2/5 = 0 // + 2/5
3/5*m = 2/5 // : 3/5
m = 2/5/3/5
m = 2/3
m = 2/3
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