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m in (-oo:+oo)
(3*m)/5+2/3 = 31/51 // - 31/51
(3*m)/5+2/3-(31/51) = 0
(3*m)/5+2/3-31/51 = 0
3/5*m+1/17 = 0 // - 1/17
3/5*m = -1/17 // : 3/5
m = -1/17/3/5
m = -5/51
m = -5/51
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