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(2x+8)+(x+18)=180
We move all terms to the left:
(2x+8)+(x+18)-(180)=0
We get rid of parentheses
2x+x+8+18-180=0
We add all the numbers together, and all the variables
3x-154=0
We move all terms containing x to the left, all other terms to the right
3x=154
x=154/3
x=51+1/3
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