Solve for b2 A=1/2(b_1+b_2)

$A = \frac{1}{2} (b_{1} + b_{2})$

Apply the distributive property.

$A = \frac{1}{2} b_{1} + \frac{1}{2} b_{2}$

Combine $\frac{1}{2}$ and $b_{1}$ .

$A = \frac{b_{1}}{2} + \frac{1}{2} b_{2}$

Combine $\frac{1}{2}$ and $b_{2}$ .

$A = \frac{b_{1}}{2} + \frac{b_{2}}{2}$

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