Question

How can you check the solution of an equation?

Answer 1

Look at the left hand side of equation and if given number matches
do the same for the right hand
see if numbers match

Answer 2

in order to check you would plug in the value of x and see if it equals the same thing.
or do the opposite of the equation. it depends on if you are dealing with x or not. so if you have 6-3 is 3 you can do 3+3 is 6