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P-((1/4)*x^3) = -5/6 // + -5/6
P-((1/4)*x^3)-(-5/6) = 0
P+(-1/4)*x^3+5/6 = 0
-1/4*x^3 = -(P+5/6) // : -1/4
x^3 = 4*(P+5/6)
x^3 = 4*(P+5/6) // ^ 1/3
x = 4^(1/3)*(P+5/6)^(1/3)
x = 4^(1/3)*(P+5/6)^(1/3)
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