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x in (-oo:+oo)
30*X-(X*((18*x^2)/6)) = 2 // - 2
30*X-(X*((18*x^2)/6))-2 = 0
30*X-3*X*x^2-2 = 0
-3*X*x^2 = -(30*X-2) // : -3*X
x^2 = (2-(30*X))/(-3*X)
x^2 = (2-30*X)/(-3*X) // ^ 1/2
abs(x) = ((2-30*X)^(1/2))/((-3)^(1/2)*X^(1/2))
x = ((2-30*X)^(1/2))/((-3)^(1/2)*X^(1/2)) or x = -(((2-30*X)^(1/2))/((-3)^(1/2)*X^(1/2)))
x in { ((2-30*X)^(1/2))/((-3)^(1/2)*X^(1/2)), -(((2-30*X)^(1/2))/((-3)^(1/2)*X^(1/2))) }
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