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2*x^2-(108/c) = 0
2*x^2-108*c^-1 = 0
2*x^2 = -(-108*c^-1) // : 2
x^2 = 54*c^-1
x^2 = 54*c^-1 // ^ 1/2
abs(x) = 3*6^(1/2)*c^(-1/2)
x = 3*6^(1/2)*c^(-1/2) or x = -(3*6^(1/2)*c^(-1/2))
x in { 3*6^(1/2)*c^(-1/2), -(3*6^(1/2)*c^(-1/2)) }
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