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X^2-(5*x)+25/4 = 0
X^2-5*x+25/4 = 0
X^2-5*x+25/4 = 0 // - X^2+25/4
-5*x = -(X^2+25/4) // : -5
x = (-(X^2+25/4))/(-5)
x = (X^2+25/4)/5
x = (X^2+25/4)/5
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