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(X^2)/2-(5*x)-17 = 0
(X^2)/2-5*x-17 = 0
1/2*X^2-5*x-17 = 0 // - 1/2*X^2-17
-5*x = -(1/2*X^2-17) // : -5
x = (-(1/2*X^2-17))/(-5)
x = (17-(1/2*X^2))/(-5)
x = (17-(1/2*X^2))/(-5)
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