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x in (-oo:+oo)
(7/3)*x^2 = (1/2)*x // - (1/2)*x
(7/3)*x^2-((1/2)*x) = 0
(7/3)*x^2+(-1/2)*x = 0
7/3*x^2-1/2*x = 0
DELTA = (-1/2)^2-(0*7/3*4)
DELTA = 1/4
DELTA > 0
x = ((1/4)^(1/2)+1/2)/(2*7/3) or x = (1/2-(1/4)^(1/2))/(2*7/3)
x = 3/14 or x = 0
x in { 0, 3/14 }
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