To isolate the variable \( x \) by getting rid of the \( 5x \) on the right side of the equation \( 5x = 6 + 5x \), you should subtract \( 5x \) from each side.
So the correct move is:
B. Subtract 5x from each side
This will lead you to:
\[ 5x - 5x = 6 + 5x - 5x \]
Which simplifies to:
\[ 0 = 6 \]
However, this indicates that there are no solutions, as 0 does not equal 6.