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c in (-oo:+oo)
4*c = (1/2)*(c^2+c^2+2+6) // - (1/2)*(c^2+c^2+2+6)
4*c-((1/2)*(c^2+c^2+2+6)) = 0
(-1/2)*(c^2+c^2+2+6)+4*c = 0
4*c-1/2*(2*c^2+8) = 0
4*c-1/2*(2*c^2+8) = 0
4*c-c^2-4 = 0
4*c-c^2-4 = 0
4*c-c^2-4 = 0
DELTA = 4^2-(-4*(-1)*4)
DELTA = 0
c = -4/(-1*2)
c = 2 or c = 2
(c-2)^2 = 0
(c-2)^2 = 0
c-2 = 0 // + 2
c = 2
c in { 2, 2 }
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