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x in (-oo:+oo)
7-(((6*x)/2)*x) = 2 // - 2
7-(((6*x)/2)*x)-2 = 0
7-3*x^2-2 = 0
-3*x^2 = -5 // : -3
x^2 = 5/3
x^2 = 5/3 // ^ 1/2
abs(x) = (5/3)^(1/2)
x = (5/3)^(1/2) or x = -(5/3)^(1/2)
x in { (5/3)^(1/2), -(5/3)^(1/2) }
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