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c in (-oo:+oo)
(2/3)*(6*c+3) = 6*(c-3) // - 6*(c-3)
(2/3)*(6*c+3)-(6*(c-3)) = 0
(2/3)*(6*c+3)-6*(c-3) = 0
2/3*(6*c+3)-6*(c-3) = 0
2/3*(6*c+3)-6*(c-3) = 0
20-2*c = 0
20-2*c = 0
20-2*c = 0 // - 20
-2*c = -20 // : -2
c = -20/(-2)
c = 10
c = 10
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