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x+(x+52)=520
We move all terms to the left:
x+(x+52)-(520)=0
We get rid of parentheses
x+x+52-520=0
We add all the numbers together, and all the variables
2x-468=0
We move all terms containing x to the left, all other terms to the right
2x=468
x=468/2
x=234
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