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m in (-oo:+oo)
(4/5)*m-(1/2) = 6/7 // - 6/7
(4/5)*m-(1/2)-(6/7) = 0
(4/5)*m-1/2-6/7 = 0
4/5*m-19/14 = 0 // + 19/14
4/5*m = 19/14 // : 4/5
m = 19/14/4/5
m = 95/56
m = 95/56
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