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(1/2)*x^2-((9/4)*x)-(5/4) = 0
(1/2)*x^2+(-9/4)*x-5/4 = 0
1/2*x^2-9/4*x-5/4 = 0
DELTA = (-9/4)^2-(-5/4*1/2*4)
DELTA = 121/16
DELTA > 0
x = ((121/16)^(1/2)+9/4)/(1/2*2) or x = (9/4-(121/16)^(1/2))/(1/2*2)
x = 5 or x = -1/2
x in { -1/2, 5 }
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