Solve for x
x=12
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2x-3=21
Combine x and x to get 2x.
2x=21+3
Add 3 to both sides.
2x=24
Add 21 and 3 to get 24.
x=\frac{24}{2}
Divide both sides by 2.
x=12
Divide 24 by 2 to get 12.
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