Without any signs between what appear to be terms, it is not possible to simplify.
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2a+6b
(ab/b) / (4a/5b) =(ab / b) * (5b / 4a) = (5ab2 / 4ab)= 5 / (4b)
5ab-2ab+4a-b+5b = 3ab+4a+4b
Add the equations: 4a + 4a - 5b + 5b = 7 + 17 ie 8a = 24 a = 3, so b = 1
The expression is: (4a+b)/(2a-5b)