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x in (-oo:+oo)
p-((1/4)*x^3) = -5/16 // + -5/16
p-((1/4)*x^3)-(-5/16) = 0
p+(-1/4)*x^3+5/16 = 0
-1/4*x^3 = -(p+5/16) // : -1/4
x^3 = 4*(p+5/16)
x^3 = 4*(p+5/16) // ^ 1/3
x = 4^(1/3)*(p+5/16)^(1/3)
x = 4^(1/3)*(p+5/16)^(1/3)
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