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y in (-oo:+oo)
((2*y^3)/(-1))/2 = 9/4-(3/3) // - 9/4-(3/3)
((2*y^3)/(-1))/2-(9/4)+3/3 = 0
(-2*y^3)/2-9/4+3/3 = 0
-1*y^3 = 5/4 // : -1
y^3 = -5/4
y^3 = -5/4 // ^ 1/3
y = -(5/4)^(1/3)
y = -(5/4)^(1/3)
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