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