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2(x+x)=543
We move all terms to the left:
2(x+x)-(543)=0
We add all the numbers together, and all the variables
2(+2x)-543=0
We multiply parentheses
4x-543=0
We move all terms containing x to the left, all other terms to the right
4x=543
x=543/4
x=135+3/4
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