Solve the equation for the specified variable.

A= 1/2h(B + b) for b

2 answers

Just do whatever legal moves it takes to make b be the only thing on one side of the equals sign. What is b in terms of everything else?
A= 1/2h(B + b)
2A = Bh + bh
2A - Bh = bh
b = (2A - Bh)/h