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x in (-oo:+oo)
(3*x^2)/4 = 36/3 // - 36/3
(3*x^2)/4-(36/3) = 0
(3*x^2)/4-12 = 0
3/4*x^2 = 12 // : 3/4
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4, -4 }
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