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m in (-oo:+oo)
(7*m)/5+5/7 = 81/35 // - 81/35
(7*m)/5+5/7-(81/35) = 0
(7*m)/5+5/7-81/35 = 0
7/5*m-8/5 = 0 // + 8/5
7/5*m = 8/5 // : 7/5
m = 8/5/7/5
m = 8/7
m = 8/7
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