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2x+(x+102)=180
We move all terms to the left:
2x+(x+102)-(180)=0
We get rid of parentheses
2x+x+102-180=0
We add all the numbers together, and all the variables
3x-78=0
We move all terms containing x to the left, all other terms to the right
3x=78
x=78/3
x=26
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