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n in (-oo:+oo)
5*n = 20*((1/4)*n+4) // - 20*((1/4)*n+4)
5*n-(20*((1/4)*n+4)) = 0
5*n-20*((1/4)*n+4) = 0
5*n-20*(1/4*n+4) = 0
5*n-20*(1/4*n+4) = 0
-80 = 0
-80 = 0
n belongs to the empty set
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