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x in (-oo:+oo)
(1/6)*a-((1/2)*(s-2)) = 45/2 // - 45/2
(1/6)*a-((1/2)*(s-2))-(45/2) = 0
(-1/2)*(s-2)+(1/6)*a-45/2 = 0
a/6-1/2*(s-2)-45/2 = 0
(-1/2*2*6*(s-2))/(2*6)+(2*a)/(2*6)+(-45*6)/(2*6) = 0
2*a-1/2*2*6*(s-2)-45*6 = 0
2*a-6*s-270+12 = 0
2*a-6*s-258 = 0
(2*a-6*s-258)/(2*6) = 0
(2*a-6*s-258)/(2*6) = 0 // * 2*6
2*a-6*s-258 = 0
x belongs to the empty set
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