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x in (-oo:+oo)
4-((7/6)*x^2) = 0
(-7/6)*x^2+4 = 0
-7/6*x^2 = -4 // : -7/6
x^2 = 24/7
x^2 = 24/7 // ^ 1/2
abs(x) = (24/7)^(1/2)
x = (24/7)^(1/2) or x = -(24/7)^(1/2)
x in { (24/7)^(1/2), -(24/7)^(1/2) }
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