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m in (-oo:+oo)
(4/5)*m+(5/6)*m-1/3 = 142/15 // - 142/15
(4/5)*m+(5/6)*m-1/3-(142/15) = 0
(4/5)*m+(5/6)*m-1/3-142/15 = 0
49/30*m-49/5 = 0 // + 49/5
49/30*m = 49/5 // : 49/30
m = 49/5/49/30
m = 6
m = 6
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