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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
DELTA = (-5)^2-(1*4*25/4)
DELTA = 0
x = 5/(1*2)
x = 5/2 or x = 5/2
x in { 5/2, 5/2 }
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