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(-1/2)*((5*x^3)/2-9) = 0
-1/2*(5/2*x^3-9) = 0
5/2*x^3 = 9 // : 5/2
x^3 = 18/5
x^3 = 18/5 // ^ 1/3
x = (18/5)^(1/3)
x = (18/5)^(1/3)
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