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x in (-oo:+oo)
S = (1/5)*(300-(10*s)) // - (1/5)*(300-(10*s))
S-((1/5)*(300-(10*s))) = 0
(-1/5)*(300-10*s)+S = 0
S-1/5*(300-10*s) = 0
S-1/5*(300-10*s) = 0
S+2*s-60 = 0
S+2*s-60 = 0
x belongs to the empty set
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