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