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2*x-((3/6)*x^2)-(7*x)-3 = 0
(-1/2)*x^2+2*x-7*x-3 = 0
-1/2*x^2-5*x-3 = 0
DELTA = (-5)^2-(-3*(-1/2)*4)
DELTA = 19
DELTA > 0
x = (19^(1/2)+5)/(-1/2*2) or x = (5-19^(1/2))/(-1/2*2)
x = -(19^(1/2)+5) or x = 19^(1/2)-5
x in { -(19^(1/2)+5), 19^(1/2)-5 }
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