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x in (-oo:+oo)
f = (6/5)*(n-18) // - (6/5)*(n-18)
f-((6/5)*(n-18)) = 0
(-6/5)*(n-18)+f = 0
f-6/5*(n-18) = 0
f-6/5*(n-18) = 0
f-6/5*n+108/5 = 0
f-6/5*n+108/5 = 0
x belongs to the empty set
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