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x in (-oo:+oo)
x/2 = x^2-3 // - x^2-3
x/2-x^2+3 = 0
1/2*x-x^2+3 = 0
DELTA = (1/2)^2-(-1*3*4)
DELTA = 49/4
DELTA > 0
x = ((49/4)^(1/2)-1/2)/(-1*2) or x = (-(49/4)^(1/2)-1/2)/(-1*2)
x = -3/2 or x = 2
x in { -3/2, 2 }
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