3x + y = 4(2-z)...Solve for x.
Subtract y from both sides. By doing so, you will isolate the term 3x.
3x = 4(2 - z) - y
We now divide both sides by the coefficient of x, which is the number 3.
x = [4(2 - z) - y]/3
By the way, you can use the distributive rule in terms of 4(2 - z) to simplify further if needed.