The equation is .

Apply addition property of equality: Add 6 to each side.

                     (Apply additive inverse property: )

                           (Apply additive identity property: )

                                     (Add:  )

Check:

To check the solution, substitute in original equation.

                              (Subtract: )

The statement is true.

To graph the solution on the number line:

\
• Draw the number line.
\
• Mark a dot at 4 on the number line.
\

The value of .