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x in (-oo:+oo)
x*x-((3/4)*x)-(7/64) = 0
x*x+(-3/4)*x-7/64 = 0
x^2-3/4*x-7/64 = 0
DELTA = (-3/4)^2-(-7/64*1*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)+3/4)/(1*2) or x = (3/4-1^(1/2))/(1*2)
x = 7/8 or x = -1/8
x in { -1/8, 7/8 }
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