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-x+13=-3x-1
We move all terms to the left:
-x+13-(-3x-1)=0
We add all the numbers together, and all the variables
-1x-(-3x-1)+13=0
We get rid of parentheses
-1x+3x+1+13=0
We add all the numbers together, and all the variables
2x+14=0
We move all terms containing x to the left, all other terms to the right
2x=-14
x=-14/2
x=-7
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