It seems like there may be a typo in your question since "6d - 54" is an expression, not an equation. To find the value of \( d \), you would typically need an equation to work with, such as setting the expression equal to some value.
For example, if you meant to write \( 6d - 54 = 0 \), you can solve for \( d \) as follows:
\[ 6d - 54 = 0 \]
Adding 54 to both sides gives:
\[ 6d = 54 \]
Now, divide both sides by 6:
\[ d = \frac{54}{6} = 9 \]
If you meant something different, please provide additional context or specify the equation you would like to solve.