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m in (-oo:+oo)
(2/5)*m = (1/3)*(2*m-12) // - (1/3)*(2*m-12)
(2/5)*m-((1/3)*(2*m-12)) = 0
(-1/3)*(2*m-12)+(2/5)*m = 0
(2*m)/5-1/3*(2*m-12) = 0
(-1/3*5*(2*m-12))/5+(2*m)/5 = 0
2*m-1/3*5*(2*m-12) = 0
20-4/3*m = 0
(20-4/3*m)/5 = 0
(20-4/3*m)/5 = 0 // * 5
20-4/3*m = 0
20-4/3*m = 0 // - 20
-4/3*m = -20 // : -4/3
m = -20/(-4/3)
m = 15
m = 15
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