The equation is .

            (Add 5 to each side)

                         (Apply Additive inverse property: 5 – 5 = 0)

                            (Add:  5 +10 = 15)

Check:

To check the solution, substitute in original equation.

10=10                              (Subtract: 15 – 5 = 10)

The statement is true.

          to graph the solution on the number line;

\
•        draw the number line
\
•       mark a dot at 15 on the number line
\

The value of r=15.