6b-(4b-(2b-5))

To simplify the expression \( 6b - (4b - (2b - 5)) \), follow these steps:

1. Start with the innermost parentheses: \( 2b - 5 \)
2. Substitute this into the expression: \[ 6b - (4b - (2b - 5)) = 6b - (4b - 2b + 5) \]
3. Simplify \( 4b - 2b + 5 \): \[ 4b - 2b + 5 = 2b + 5 \]
4. Now substitute back into the expression: \[ 6b - (2b + 5) \]
5. Distribute the negative sign: \[ 6b - 2b - 5 \]
6. Combine like terms: \[ (6b - 2b) - 5 = 4b - 5 \]

So, the simplified expression is \( 4b - 5 \).