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(X^2)/2-x = 60 // - 60
(X^2)/2-x-60 = 0
1/2*X^2-x-60 = 0 // - 1/2*X^2-60
-x = -(1/2*X^2-60) // * -1
x = 1/2*X^2-60
x = 1/2*X^2-60
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