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x+(3x-2)=518
We move all terms to the left:
x+(3x-2)-(518)=0
We get rid of parentheses
x+3x-2-518=0
We add all the numbers together, and all the variables
4x-520=0
We move all terms containing x to the left, all other terms to the right
4x=520
x=520/4
x=130
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