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m in (-oo:+oo)
5/6-(((2*m)/2)*m)+3 = 19/6 // - 19/6
5/6-(((2*m)/2)*m)-(19/6)+3 = 0
5/6-m^2-19/6+3 = 0
-1*m^2 = -2/3 // : -1
m^2 = 2/3
m^2 = 2/3 // ^ 1/2
abs(m) = (2/3)^(1/2)
m = (2/3)^(1/2) or m = -(2/3)^(1/2)
m in { (2/3)^(1/2), -(2/3)^(1/2) }
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