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(x/2)*x+(3/2)*x-6 = 0
1/2*x^2+3/2*x-6 = 0
DELTA = (3/2)^2-(-6*1/2*4)
DELTA = 57/4
DELTA > 0
x = ((57/4)^(1/2)-3/2)/(1/2*2) or x = (-(57/4)^(1/2)-3/2)/(1/2*2)
x = (57/4)^(1/2)-3/2 or x = -((57/4)^(1/2)+3/2)
x in { -((57/4)^(1/2)+3/2), (57/4)^(1/2)-3/2 }
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