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x+1+2x=2x+7
We move all terms to the left:
x+1+2x-(2x+7)=0
We add all the numbers together, and all the variables
3x-(2x+7)+1=0
We get rid of parentheses
3x-2x-7+1=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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