Well what ever you do to one side, you do to the other.
Your goal is to get the x alone
in order to do that we divide both sides by 4
4x = 16
÷4 = ÷4 The left side cancels out and the right side gets solved
********* because 16 ÷ 4 = 4 :)
x = 4
And there's your answer
x = 4
When in doubt, eat a pineapple :)