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y in (-oo:+oo)
6 = (y/4)*y // - (y/4)*y
6-((y/4)*y) = 0
(-1/4)*y^2+6 = 0
-1/4*y^2 = -6 // : -1/4
y^2 = 24
y^2 = 24 // ^ 1/2
abs(y) = 2*6^(1/2)
y = 2*6^(1/2) or y = -(2*6^(1/2))
y in { 2*6^(1/2), -(2*6^(1/2)) }
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