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3x-13=-x-1
We move all terms to the left:
3x-13-(-x-1)=0
We add all the numbers together, and all the variables
3x-(-1x-1)-13=0
We get rid of parentheses
3x+1x+1-13=0
We add all the numbers together, and all the variables
4x-12=0
We move all terms containing x to the left, all other terms to the right
4x=12
x=12/4
x=3
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