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((-1/2)*x^3)/7 = 11/14 // - 11/14
((-1/2)*x^3)/7-(11/14) = 0
((-1/2)*x^3)/7-11/14 = 0
-1/14*x^3 = 11/14 // : -1/14
x^3 = -11
x^3 = -11 // ^ 1/3
x = -11^(1/3)
x = -11^(1/3)
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