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2x+2x=x-1
We move all terms to the left:
2x+2x-(x-1)=0
We add all the numbers together, and all the variables
4x-(x-1)=0
We get rid of parentheses
4x-x+1=0
We add all the numbers together, and all the variables
3x+1=0
We move all terms containing x to the left, all other terms to the right
3x=-1
x=-1/3
x=-1/3
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