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m in (-oo:+oo)
(4/5)*m-(1/3) = 5/7 // - 5/7
(4/5)*m-(1/3)-(5/7) = 0
(4/5)*m-1/3-5/7 = 0
4/5*m-22/21 = 0 // + 22/21
4/5*m = 22/21 // : 4/5
m = 22/21/4/5
m = 55/42
m = 55/42
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