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x in (-oo:+oo)
(x^2)/4 = 36 // - 36
(x^2)/4-36 = 0
1/4*x^2 = 36 // : 1/4
x^2 = 144
x^2 = 144 // ^ 1/2
abs(x) = 12
x = 12 or x = -12
x in { 12, -12 }
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