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m in (-oo:+oo)
(5/7)*m = 25/49 // - 25/49
(5/7)*m-(25/49) = 0
(5/7)*m-25/49 = 0
5/7*m-25/49 = 0 // + 25/49
5/7*m = 25/49 // : 5/7
m = 25/49/5/7
m = 5/7
m = 5/7
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