Salutations!
What is the solution of x + 4 = 12?
x + 4= 12
Isolate the numbers ---
x = 12 - 4
Be careful while isolating the numbers, you might get an incorrect answer if you do not enter the right signs,
x = 12 - 4
x = 8
You can now verify your answer by substituting the value of x by 8.
8 + 4 = 12.
The answer 8 is correct!
Hope I helped (:
Have a great day!