If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
s = (n/2)*(a+b) // - (n/2)*(a+b)
s-((n/2)*(a+b)) = 0
s-1*1/2*n*(a+b) = 0
s-1*1/2*n*(a+b) = 0
s-1/2*a*n-1/2*b*n = 0
s-1/2*a*n-1/2*b*n = 0
x belongs to the empty set
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