Solve for b2:A= 1/2h (b1+b2)  

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A = 1/2h(b1+b2)

Multiply both sides by 2

2A = h(b1+b2)

Multiply both sides by 1/h

2A/h = b1+b2

Add -b1 to both sides

2A/h + -b1 = b2


b2 = 2A/h - b1

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