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m in (-oo:+oo)
(2/3)*m-(1/5) = 4/7 // - 4/7
(2/3)*m-(1/5)-(4/7) = 0
(2/3)*m-1/5-4/7 = 0
2/3*m-27/35 = 0 // + 27/35
2/3*m = 27/35 // : 2/3
m = 27/35/2/3
m = 81/70
m = 81/70
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