not sure how to do

a=1/2h(b+B)

2a=h(b+B) multiply both sides by 2

2a/h=b+B divide both sides by h

b=2a/h-B subtract B from both sides

not sure how to do

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a=1/2h(b+B)

2a=h(b+B) multiply both sides by 2

2a/h=b+B divide both sides by h

b=2a/h-B subtract B from both sides