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m in (-oo:+oo)
(15/5)*m = 26/6 // - 26/6
(15/5)*m-(26/6) = 0
(15/5)*m-13/3 = 0
3*m-13/3 = 0 // + 13/3
3*m = 13/3 // : 3
m = 13/3/3
m = 13/9
m = 13/9
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