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x in (-oo:+oo)
f = (9/5)*(n-72) // - (9/5)*(n-72)
f-((9/5)*(n-72)) = 0
(-9/5)*(n-72)+f = 0
f-9/5*(n-72) = 0
f-9/5*(n-72) = 0
f-9/5*n+648/5 = 0
f-9/5*n+648/5 = 0
x belongs to the empty set
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