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x+(x-42)=808
We move all terms to the left:
x+(x-42)-(808)=0
We get rid of parentheses
x+x-42-808=0
We add all the numbers together, and all the variables
2x-850=0
We move all terms containing x to the left, all other terms to the right
2x=850
x=850/2
x=425
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