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s in (-oo:+oo)
(11/2)*s-9 = (11/2)*s+45 // - (11/2)*s+45
(11/2)*s-((11/2)*s)-45-9 = 0
(11/2)*s+(-11/2)*s-45-9 = 0
-54 = 0
s belongs to the empty set
s belongs to the empty set
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