Solve for w
w=21
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2w+9=51
Swap sides so that all variable terms are on the left hand side.
2w=51-9
Subtract 9 from both sides.
2w=42
Subtract 9 from 51 to get 42.
w=\frac{42}{2}
Divide both sides by 2.
w=21
Divide 42 by 2 to get 21.
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