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x in (-oo:+oo)
f = (3/2)*(n-90) // - (3/2)*(n-90)
f-((3/2)*(n-90)) = 0
(-3/2)*(n-90)+f = 0
f-3/2*(n-90) = 0
f-3/2*(n-90) = 0
f-3/2*n+135 = 0
f-3/2*n+135 = 0
x belongs to the empty set
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