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m in (-oo:+oo)
(2/3)*m+(1/5)*m = 26 // - 26
(2/3)*m+(1/5)*m-26 = 0
13/15*m-26 = 0 // + 26
13/15*m = 26 // : 13/15
m = 26/13/15
m = 30
m = 30
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