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m in (-oo:+oo)
(2*m)/7 = 6/21 // - 6/21
(2*m)/7-(6/21) = 0
(2*m)/7-2/7 = 0
2/7*m-2/7 = 0 // + 2/7
2/7*m = 2/7 // : 2/7
m = 2/7/2/7
m = 1
m = 1
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