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(X^2-x)/2 = 66 // - 66
(X^2-x)/2-66 = 0
(X^2-x)/2+(-66*2)/2 = 0
X^2-x-66*2 = 0
X^2-x-132 = 0
(X^2-x-132)/2 = 0
(X^2-x-132)/2 = 0 // * 2
X^2-x-132 = 0
X^2-x-132 = 0 // - X^2-132
-x = -(X^2-132) // * -1
x = X^2-132
x = X^2-132
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