The question contains neither an expression nor an equation (or inequality). There can, therefore be no sensible answer.
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5ab-2ab+4a-b+5b = 3ab+4a+4b
a-b+a-b+2b+a = 4a
4a + 3c - 2b - c + a - b = 5a - 3b + 2c
The expression is: (4a+b)/(2a-5b)
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b