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(6/12)*x^2+3*x-((2/4)*x) = 0
(6/12)*x^2+3*x+(-1/2)*x = 0
1/2*x^2+5/2*x = 0
DELTA = (5/2)^2-(0*1/2*4)
DELTA = 25/4
DELTA > 0
x = ((25/4)^(1/2)-5/2)/(1/2*2) or x = (-(25/4)^(1/2)-5/2)/(1/2*2)
x = 0 or x = -5
x in { -5, 0 }
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