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m in (-oo:+oo)
(7/4)*m = 2/5 // - 2/5
(7/4)*m-(2/5) = 0
(7/4)*m-2/5 = 0
7/4*m-2/5 = 0 // + 2/5
7/4*m = 2/5 // : 7/4
m = 2/5/7/4
m = 8/35
m = 8/35
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