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2x+(x+1)=180
We move all terms to the left:
2x+(x+1)-(180)=0
We get rid of parentheses
2x+x+1-180=0
We add all the numbers together, and all the variables
3x-179=0
We move all terms containing x to the left, all other terms to the right
3x=179
x=179/3
x=59+2/3
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