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x in (-oo:+oo)
-4*x^3 = 7/15-1 // - 7/15-1
1-4*x^3-(7/15) = 0
1-4*x^3-7/15 = 0
-4*x^3 = -8/15 // : -4
x^3 = 2/15
x^3 = 2/15 // ^ 1/3
x = (2/15)^(1/3)
x = (2/15)^(1/3)
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