If 1 / a plus 1 / b equals (a plus 4 / b), what is the value of a / B plus a / b

1 of a plus 1 of B equals (a plus 4 of B)
(a+b)/ab=4/(a+b)
(a+b)²/ab=4
(a²+b²+2ab)/ab=4
(a²+b²)/ab+2=4
b/a+a/b=2

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