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-13=-4x-1
We move all terms to the left:
-13-(-4x-1)=0
We get rid of parentheses
4x+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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