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(1/2)*x^2-((7/4)*x)-(15/2) = 0
(1/2)*x^2+(-7/4)*x-15/2 = 0
1/2*x^2-7/4*x-15/2 = 0
DELTA = (-7/4)^2-(-15/2*1/2*4)
DELTA = 289/16
DELTA > 0
x = ((289/16)^(1/2)+7/4)/(1/2*2) or x = (7/4-(289/16)^(1/2))/(1/2*2)
x = 6 or x = -5/2
x in { -5/2, 6 }
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