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s in (-oo:+oo)
(1/6)*s-((1/2)*(s-2)) = 45-2 // - 45-2
(1/6)*s-((1/2)*(s-2))-45+2 = 0
(-1/2)*(s-2)+(1/6)*s-45+2 = 0
s/6-1/2*(s-2)-45+2 = 0
(-1/2*6*(s-2))/6+s/6+(-45*6)/6+(2*6)/6 = 0
s-1/2*6*(s-2)-45*6+2*6 = 0
6-2*s-270+12 = 0
12-2*s-264 = 0
-2*s-252 = 0
(-2*s-252)/6 = 0
(-2*s-252)/6 = 0 // * 6
-2*s-252 = 0
-2*s-252 = 0 // + 252
-2*s = 252 // : -2
s = 252/(-2)
s = -126
s = -126
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