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s in (-oo:+oo)
(1/6)*(12-12*s)-((1/6)*(12*s+18)) = 0
(1/6)*(12-12*s)+(-1/6)*(12*s+18) = 0
1/6*(12-12*s)-1/6*(12*s+18) = 0
1/6*(12-12*s)-1/6*(12*s+18) = 0
-4*s-1 = 0
-4*s-1 = 0
-4*s-1 = 0 // + 1
-4*s = 1 // : -4
s = 1/(-4)
s = -1/4
s = -1/4
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