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(7*x^3)/2 = -14 // + 14
(7*x^3)/2+14 = 0
7/2*x^3 = -14 // : 7/2
x^3 = -4
x^3 = -4 // ^ 1/3
x = -4^(1/3)
x = -4^(1/3)
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