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m in (-oo:+oo)
(5/7)*m-(3/5) = 79/35 // - 79/35
(5/7)*m-(3/5)-(79/35) = 0
(5/7)*m-3/5-79/35 = 0
5/7*m-20/7 = 0 // + 20/7
5/7*m = 20/7 // : 5/7
m = 20/7/5/7
m = 4
m = 4
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