Solve for w
w = \frac{159}{2} = 79\frac{1}{2} = 79.5
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21+2w=180
Swap sides so that all variable terms are on the left hand side.
2w=180-21
Subtract 21 from both sides.
2w=159
Subtract 21 from 180 to get 159.
w=\frac{159}{2}
Divide both sides by 2.
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