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2(x+13)+13=43
We move all terms to the left:
2(x+13)+13-(43)=0
We add all the numbers together, and all the variables
2(x+13)-30=0
We multiply parentheses
2x+26-30=0
We add all the numbers together, and all the variables
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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