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