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2^(x+3)/2^(x-1)= 2^(4)
(2^x)*(2^3)/(2^x)*(2^(-1))= 2^(4)
simplificamos (2^x)
(2^3)/(2^(-1))=2^(4)
(2^3)*(2^(1))=2^(4)
2^(4)=2^(4)