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Anonymous
(ab/b) / (4a/5b) =
(ab / b) * (5b / 4a) = (5ab2 / 4ab)
= 5 / (4b)
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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)
3a - 2b
2a+6b