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(X^2)/3-(3*x)-4 = 0
(X^2)/3-3*x-4 = 0
1/3*X^2-3*x-4 = 0 // - 1/3*X^2-4
-3*x = -(1/3*X^2-4) // : -3
x = (-(1/3*X^2-4))/(-3)
x = (4-(1/3*X^2))/(-3)
x = (4-(1/3*X^2))/(-3)
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