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(X^2)/12-(x/3)-1 = 0
1/12*X^2-1/3*x-1 = 0 // - 1/12*X^2-1
-1/3*x = -(1/12*X^2-1) // : -1/3
x = (-(1/12*X^2-1))/(-1/3)
x = -3*(1-(1/12*X^2))
x = -3*(1-(1/12*X^2))
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