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y in (-oo:+oo)
(y^3)/2 = -18 // + 18
(y^3)/2+18 = 0
1/2*y^3 = -18 // : 1/2
y^3 = -36
y^3 = -36 // ^ 1/3
y = -36^(1/3)
y = -36^(1/3)
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