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m in (-oo:+oo)
(3*m)/13+2/3 = 8/13 // - 8/13
(3*m)/13+2/3-(8/13) = 0
(3*m)/13+2/3-8/13 = 0
3/13*m+2/39 = 0 // - 2/39
3/13*m = -2/39 // : 3/13
m = -2/39/3/13
m = -2/9
m = -2/9
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