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90+x+(x-52)=180
We move all terms to the left:
90+x+(x-52)-(180)=0
We add all the numbers together, and all the variables
x+(x-52)-90=0
We get rid of parentheses
x+x-52-90=0
We add all the numbers together, and all the variables
2x-142=0
We move all terms containing x to the left, all other terms to the right
2x=142
x=142/2
x=71
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