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m in (-oo:+oo)
(3/5)*m = 2/7 // - 2/7
(3/5)*m-(2/7) = 0
(3/5)*m-2/7 = 0
3/5*m-2/7 = 0 // + 2/7
3/5*m = 2/7 // : 3/5
m = 2/7/3/5
m = 10/21
m = 10/21
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