Thinking Mathematically (6th Edition)

We need to isolate x on one side of the equation. On the RHS, the term "+b" is removed by subtracting b from both sides. The resulting equation is $y-b=mx.$ Now, m is removed from x by dividing both sides with m: $\displaystyle \frac{y-b}{m}=x.$ Fill the blanks with ... subtract b, ... ... divide with m.