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x in (-oo:+oo)
(1/2)*x-30 = (1/6)*x^2 // - (1/6)*x^2
(1/2)*x-((1/6)*x^2)-30 = 0
(-1/6)*x^2+(1/2)*x-30 = 0
1/2*x-1/6*x^2-30 = 0
DELTA = (1/2)^2-(-30*(-1/6)*4)
DELTA = -79/4
DELTA < 0
x belongs to the empty set
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