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