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m in (-oo:+oo)
(7*m)/3+5/7 = 71/21 // - 71/21
(7*m)/3+5/7-(71/21) = 0
(7*m)/3+5/7-71/21 = 0
7/3*m-8/3 = 0 // + 8/3
7/3*m = 8/3 // : 7/3
m = 8/3/7/3
m = 8/7
m = 8/7
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