Solve for a
a=26
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128+a+a=180
Add 90 and 38 to get 128.
128+2a=180
Combine a and a to get 2a.
2a=180-128
Subtract 128 from both sides.
2a=52
Subtract 128 from 180 to get 52.
a=\frac{52}{2}
Divide both sides by 2.
a=26
Divide 52 by 2 to get 26.
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