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5x+(x+13)+(x+13)=180
We move all terms to the left:
5x+(x+13)+(x+13)-(180)=0
We get rid of parentheses
5x+x+x+13+13-180=0
We add all the numbers together, and all the variables
7x-154=0
We move all terms containing x to the left, all other terms to the right
7x=154
x=154/7
x=22
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