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x in (-oo:+oo)
12-((x^3)/5) = y // - y
12-((x^3)/5)-y = 0
-1/5*x^3 = -(12-y) // : -1/5
x^3 = -5*(y-12)
x^3 = -5*(y-12) // ^ 1/3
x = -5^(1/3)*(y-12)^(1/3)
x = -5^(1/3)*(y-12)^(1/3)
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