Question

x-b/a=c, for b solve each equation or formula for the variable specified.

Answer 1

is the question (x-b)/a or just b/a

Answer 2

You want to get b by itself on one side.

So multiply both sides by a
x-b=ac

Then subtract x from both sides
-b=ac-x

Then divide both sides by -1
b=-ac + x

Assuming the question is x-(b/a)=c
If not, then it's the same concept but with a different equation.