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x+(x+43)+(x+31)=180
We move all terms to the left:
x+(x+43)+(x+31)-(180)=0
We get rid of parentheses
x+x+x+43+31-180=0
We add all the numbers together, and all the variables
3x-106=0
We move all terms containing x to the left, all other terms to the right
3x=106
x=106/3
x=35+1/3
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