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