Solve for x
x=12
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2x+156-180=0
Add 20 and 136 to get 156.
2x-24=0
Subtract 180 from 156 to get -24.
2x=24
Add 24 to both sides. Anything plus zero gives itself.
x=\frac{24}{2}
Divide both sides by 2.
x=12
Divide 24 by 2 to get 12.
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