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(x/2)*x-(3*x)-((2/4)*x)-3+1 = 0
(x/2)*x-3*x+(-1/2)*x-3+1 = 0
1/2*x^2-7/2*x-2 = 0
DELTA = (-7/2)^2-(-2*1/2*4)
DELTA = 65/4
DELTA > 0
x = ((65/4)^(1/2)+7/2)/(1/2*2) or x = (7/2-(65/4)^(1/2))/(1/2*2)
x = (65/4)^(1/2)+7/2 or x = 7/2-(65/4)^(1/2)
x in { 7/2-(65/4)^(1/2), (65/4)^(1/2)+7/2 }
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