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x in (-oo:+oo)
0 = (-1/4)*x^2 // - (-1/4)*x^2
0-((-1/4)*x^2) = 0
(1/4)*x^2 = 0
1/4*x^2 = 0 // : 1/4
x^2 = 0
x = 0
x = 0
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