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m in (-oo:+oo)
(7/4)*m = 3/5 // - 3/5
(7/4)*m-(3/5) = 0
(7/4)*m-3/5 = 0
7/4*m-3/5 = 0 // + 3/5
7/4*m = 3/5 // : 7/4
m = 3/5/7/4
m = 12/35
m = 12/35
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