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x in (-oo:+oo)
12-((x/2)*x) = 0
(-1/2)*x^2+12 = 0
-1/2*x^2 = -12 // : -1/2
x^2 = 24
x^2 = 24 // ^ 1/2
abs(x) = 2*6^(1/2)
x = 2*6^(1/2) or x = -(2*6^(1/2))
x in { 2*6^(1/2), -(2*6^(1/2)) }
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