A = h(b1 + b2)/2 (multiply both sides by 2)
2A = h(b1 + b2) (divide both sides by h)
2A/h = b1 + b2 (subtract b2 from both sides)
2A/h - b2 = b1
b1 = 2A/h - b2 <===ANSWER
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A = h(b1 + b2)/2 (multiply both sides by 2)
2A = h(b1 + b2) (divide both sides by h)
2A/h = b1 + b2 (subtract b2 from both sides)
2A/h - b2 = b1
b1 = 2A/h - b2 <===ANSWER