Solve for x
x=190
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2x+20=400
Combine x and x to get 2x.
2x=400-20
Subtract 20 from both sides.
2x=380
Subtract 20 from 400 to get 380.
x=\frac{380}{2}
Divide both sides by 2.
x=190
Divide 380 by 2 to get 190.
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