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x in (-oo:+oo)
x^2-(2*x)+7/16 = 0
x^2-2*x+7/16 = 0
x^2-2*x+7/16 = 0
DELTA = (-2)^2-(7/16*1*4)
DELTA = 9/4
DELTA > 0
x = ((9/4)^(1/2)+2)/(1*2) or x = (2-(9/4)^(1/2))/(1*2)
x = 7/4 or x = 1/4
x in { 1/4, 7/4 }
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