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(1/4)*x^2+(3/2)*x-(27/4) = 0
(1/4)*x^2+(3/2)*x-27/4 = 0
1/4*x^2+3/2*x-27/4 = 0
DELTA = (3/2)^2-(-27/4*1/4*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)-3/2)/(1/4*2) or x = (-9^(1/2)-3/2)/(1/4*2)
x = 3 or x = -9
x in { -9, 3 }
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