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x in (-oo:+oo)
3.5/4.2 = (x/6)^3 // - (x/6)^3
3.5/4.2-(x/6)^3 = 0
-1/216*x^3 = -0.83333333 // : -1/216
x^3 = 179.99998488
x^3 = 179.99998488 // ^ 1/3
x = 179.99998488^(1/3)
x = 179.99998488^(1/3)
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