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x in (-oo:+oo)
y = (7/8)*x^3 // - (7/8)*x^3
y-((7/8)*x^3) = 0
(-7/8)*x^3+y = 0
-7/8*x^3 = -y // : -7/8
x^3 = 8/7*y
x^3 = 8/7*y // ^ 1/3
x = (8/7)^(1/3)*y^(1/3)
x = (8/7)^(1/3)*y^(1/3)
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