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4x+13=x-1-7
We move all terms to the left:
4x+13-(x-1-7)=0
We add all the numbers together, and all the variables
4x-(x-8)+13=0
We get rid of parentheses
4x-x+8+13=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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