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m in (-oo:+oo)
(3*m)/5+2/3 = 21/15 // - 21/15
(3*m)/5+2/3-(21/15) = 0
(3*m)/5+2/3-7/5 = 0
3/5*m-11/15 = 0 // + 11/15
3/5*m = 11/15 // : 3/5
m = 11/15/3/5
m = 11/9
m = 11/9
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