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x in (-oo:+oo)
x^2 = 4*((8^1)/2) // - 4*((8^1)/2)
x^2-(4*((8^1)/2)) = 0
x^2-16 = 0
1*x^2 = 16 // : 1
x^2 = 16
x^2 = 16 // ^ 1/2
abs(x) = 4
x = 4 or x = -4
x in { 4, -4 }
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