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m in (-oo:+oo)
(2/7)*m = 8/21 // - 8/21
(2/7)*m-(8/21) = 0
(2/7)*m-8/21 = 0
2/7*m-8/21 = 0 // + 8/21
2/7*m = 8/21 // : 2/7
m = 8/21/2/7
m = 4/3
m = 4/3
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