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x in (-oo:+oo)
2 = (1/7)*x^3 // - (1/7)*x^3
2-((1/7)*x^3) = 0
(-1/7)*x^3+2 = 0
-1/7*x^3 = -2 // : -1/7
x^3 = 14
x^3 = 14 // ^ 1/3
x = 14^(1/3)
x = 14^(1/3)
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