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(1/4)*x^3 = -27/4 // + -27/4
(1/4)*x^3-(-27/4) = 0
(1/4)*x^3+27/4 = 0
1/4*x^3 = -27/4 // : 1/4
x^3 = -27
x^3 = -27 // ^ 1/3
x = -3
x = -3
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