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m in (-oo:+oo)
-115/6 = -4*m-((2/3)*m)-(1/2) // + -4*m-((2/3)*m)-(1/2)
(2/3)*m-(-4*m)-115/6+1/2 = 0
4*m+(2/3)*m-115/6+1/2 = 0
14/3*m-56/3 = 0 // + 56/3
14/3*m = 56/3 // : 14/3
m = 56/3/14/3
m = 4
m = 4
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