1) Multiply both sides of the equation by 2:
2(A)=2[1/2h(b+B)
2A=2/2h(b+B)
2A=1h(b+B)
2A=h(b+B)
2) Divide both sides of the equation by (b+B):
(2A)/(b+B)=[h(b+B)]/(b+B)
2A/(b+B)=h
h=2A/(b+B)
Answer:
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