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x in (-oo:+oo)
(x^2)/4+x = 5/4 // - 5/4
(x^2)/4+x-(5/4) = 0
(x^2)/4+x-5/4 = 0
1/4*x^2+x-5/4 = 0
DELTA = 1^2-(-5/4*1/4*4)
DELTA = 9/4
DELTA > 0
x = ((9/4)^(1/2)-1)/(1/4*2) or x = (-(9/4)^(1/2)-1)/(1/4*2)
x = 1 or x = -5
x in { -5, 1 }
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