What is a=h (b+c) (solve for b)

1. a=h (b+c)

2. distribute the h:

a=hb+hc

3. move the 'hb' to the left:

a - hb = hc

4. subtract the a from both sides:

-hb = hc - a

5. divide both sides by - h to isolate b:

b = - hc+a/h