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