Solve for b. A = 1/2ha + 1/2hb
First step is to isolate the term with b, by subtracting the term 1/2ha from each side of the equation because 1/2ha is attached to 1/2hb by addition.
A =1/2ha + 1/2hb
Now we have to separate b from 1/2h. Since the terms are connected by multiplication we use the opposite operation, division, to separate them
`(A-1/2 ha)-:(1/2 h) = (1/2 hb)-:(1/2 h)`
This yields `b=A/(1/2 h) - a` that's the equation solved for b. Simplifying the equation we get `b=(2A)/h - a`