4.

x + 2 = 5

 

Subtract 2 from both sides

x

+

2

=

5

-

2

-

2

x

=

3

Check:

 

To check a solution to an equation, copy the equation except where

your unknown occurs, substitute the solution in parentheses.

 

(2) + 3 = 5

 

Since this is true, the solution checks.