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x in (-oo:+oo)
x^2-((3/4)*x)-(27/64) = 0
x^2+(-3/4)*x-27/64 = 0
x^2-3/4*x-27/64 = 0
DELTA = (-3/4)^2-(-27/64*1*4)
DELTA = 9/4
DELTA > 0
x = ((9/4)^(1/2)+3/4)/(1*2) or x = (3/4-(9/4)^(1/2))/(1*2)
x = 9/8 or x = -3/8
x in { -3/8, 9/8 }
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