56-d=31

To solve the equation \( 56 - d = 31 \), follow these steps:

1. Subtract 56 from both sides:

   \[ -d = 31 - 56 \]

2. Calculate the right side:

   \[ -d = -25 \]

3. Multiply both sides by -1 to solve for \( d \):

   \[ d = 25 \]

Thus, the solution is \( d = 25 \).