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x in (-oo:+oo)
1 = (16*x^3)/4 // - (16*x^3)/4
1-((16*x^3)/4) = 0
1-4*x^3 = 0
-4*x^3 = -1 // : -4
x^3 = 1/4
x^3 = 1/4 // ^ 1/3
x = (1/4)^(1/3)
x = (1/4)^(1/3)
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