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(6*X^3-42)/6-x = 0
(6*X^3-42)/6+(6*(-x))/6 = 0
6*X^3+6*(-x)-42 = 0
6*X^3-6*x-42 = 0
(6*X^3-6*x-42)/6 = 0
(6*X^3-6*x-42)/6 = 0 // * 6
6*X^3-6*x-42 = 0
6*X^3-6*x-42 = 0 // - 6*X^3-42
-6*x = -(6*X^3-42) // : -6
x = (-(6*X^3-42))/(-6)
x = (42-(6*X^3))/(-6)
x = (42-(6*X^3))/(-6)
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