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(5/2)*x^2+3*x-6 = 0
5/2*x^2+3*x-6 = 0
DELTA = 3^2-(-6*5/2*4)
DELTA = 69
DELTA > 0
x = (69^(1/2)-3)/(2*5/2) or x = (-69^(1/2)-3)/(2*5/2)
x = (69^(1/2)-3)/5 or x = (-(69^(1/2)+3))/5
x in { (-(69^(1/2)+3))/5, (69^(1/2)-3)/5 }
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