Solve for x
x=10
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x+20+x=40
Add x to both sides.
2x+20=40
Combine x and x to get 2x.
2x=40-20
Subtract 20 from both sides.
2x=20
Subtract 20 from 40 to get 20.
x=\frac{20}{2}
Divide both sides by 2.
x=10
Divide 20 by 2 to get 10.
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