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