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x in (-oo:+oo)
s = (1/5)*(w-(10*e)) // - (1/5)*(w-(10*e))
s-((1/5)*(w-(10*e))) = 0
(-1/5)*(w-10*e)+s = 0
s-1/5*(w-10*e) = 0
s-1/5*(w-10*e) = 0
s-1/5*w+2*e = 0
s-1/5*w+2*e = 0
x belongs to the empty set
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