If you are doing a literal equation all you have to do is isolate the h. First get rid of the fraction by multiplying both sides by 2. 2a=bh Then divide both sides by b. 2a/b=h Hope this helps!
A=(1/2)bh solving the expression for h means getting h on one side by itself A/(1/2)b=h so you need to divide both sides by 1/2 and b 2A/b=h you divided by a fraction so you multiply by the reciprocal which is 2 b stays on the bottom so you have 2A over b = h