x + 36 = 4x
First, subtract x from both sides. / Your problem should look like: 36 = 4x - x
Second, simplify 4x - x to get 3x. / Your problem should look like: 36 = 3x
Third, divide both sides by 3. / Your problem should look like:

= x
Fourth, simplify

to get 12. / Your problem should look like: 12 = x
Fifth, switch the problem around (switch sides). / Your problem should look like: x = 12
Answer:
x = 12