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m in (-oo:+oo)
(2/15)*m = 4/7 // - 4/7
(2/15)*m-(4/7) = 0
(2/15)*m-4/7 = 0
2/15*m-4/7 = 0 // + 4/7
2/15*m = 4/7 // : 2/15
m = 4/7/2/15
m = 30/7
m = 30/7
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