The expression is .

According to addition property of equality: If a = b then a + c = b + c

       (Add 49 to each side)

                 (Additive inverse property: )

                            (Add: )

                                  (Additive identity property: )     

check:

To check the solution Substitute the value of  in above expression.

                            (Subtract: )

The value of

By the number line .