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m in (-oo:+oo)
(3/5)*m+2/3 = 31/15 // - 31/15
(3/5)*m+2/3-(31/15) = 0
(3/5)*m+2/3-31/15 = 0
3/5*m-7/5 = 0 // + 7/5
3/5*m = 7/5 // : 3/5
m = 7/5/3/5
m = 7/3
m = 7/3
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