We have to solve the following equation for the variable x:

For doing so, we assume that the variables a, b, c and d behave as normal numbers, and we will move the terms with x to the left side, and those who doesn't have it, to the right.

Now, we will factor the variable x, as we want to have just one expression with x, thus:

And lastly, we will divide both sides by 2a-c, and we obtain:

Which is the asked expression for x.