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x in (-oo:+oo)
y^2 = (18*x)/3 // - (18*x)/3
y^2-((18*x)/3) = 0
y^2-6*x = 0
y^2-6*x = 0 // - y^2
-6*x = -y^2 // : -6
x = (-y^2)/(-6)
x = (y^2)/6
x = (y^2)/6
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