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x in (-oo:+oo)
f = (9/7)*(n-47) // - (9/7)*(n-47)
f-((9/7)*(n-47)) = 0
(-9/7)*(n-47)+f = 0
f-9/7*(n-47) = 0
f-9/7*(n-47) = 0
f-9/7*n+423/7 = 0
f-9/7*n+423/7 = 0
x belongs to the empty set
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