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m in (-oo:+oo)
(2*m)/5 = (1/3)*(2*m-(12/4)) // - (1/3)*(2*m-(12/4))
(2*m)/5-((1/3)*(2*m-(12/4))) = 0
(-1/3)*(2*m-3)+(2*m)/5 = 0
(2*m)/5-1/3*(2*m-3) = 0
(-1/3*5*(2*m-3))/5+(2*m)/5 = 0
2*m-1/3*5*(2*m-3) = 0
5-4/3*m = 0
(5-4/3*m)/5 = 0
(5-4/3*m)/5 = 0 // * 5
5-4/3*m = 0
5-4/3*m = 0 // - 5
-4/3*m = -5 // : -4/3
m = -5/(-4/3)
m = 15/4
m = 15/4
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