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