Solve for w
w=140
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840=560+2w
Multiply 2 and 280 to get 560.
560+2w=840
Swap sides so that all variable terms are on the left hand side.
2w=840-560
Subtract 560 from both sides.
2w=280
Subtract 560 from 840 to get 280.
w=\frac{280}{2}
Divide both sides by 2.
w=140
Divide 280 by 2 to get 140.
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