What is the value of the expression (7/x)+(7/z) divided by (7/x)-(7/z)?

A) (7/x)+(7/z) divided by (7/x)-(7/z)
B) (7/x)+(7/z) divided by (7/x)+(7/z)
C) (7/x)-(7/z) divided by (7/x)-(7/z)
D) (7/x)-(7/z) divided by (7/x)+(7/z)