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x in (-oo:+oo)
x^2-((1/2)*x)-(3/16) = 0
x^2+(-1/2)*x-3/16 = 0
x^2-1/2*x-3/16 = 0
DELTA = (-1/2)^2-(-3/16*1*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+1/2)/(1*2) or x = (1/2-1^(1/2))/(1*2)
x = 3/4 or x = -1/4
x in { -1/4, 3/4 }
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