66-(34+y)+56=73

To solve the equation \( 66 - (34 + y) + 56 = 73 \), let's simplify step by step.

1. Combine the constants on the left side: \[ 66 + 56 - 34 - y = 73 \] This gives: \[ 122 - 34 - y = 73 \] Which simplifies to: \[ 88 - y = 73 \]

2. To isolate \( y \), subtract 88 from both sides: \[ -y = 73 - 88 \] This simplifies to: \[ -y = -15 \]

3. Multiply both sides by -1 to solve for \( y \): \[ y = 15 \]

Therefore, the solution is: \[ y = 15 \]