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x in (-oo:+oo)
64 = (x^2)/4 // - (x^2)/4
64-((x^2)/4) = 0
-1/4*x^2 = -64 // : -1/4
x^2 = 256
x^2 = 256 // ^ 1/2
abs(x) = 16
x = 16 or x = -16
x in { 16, -16 }
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