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1+x=13+3x
We move all terms to the left:
1+x-(13+3x)=0
We add all the numbers together, and all the variables
x-(3x+13)+1=0
We get rid of parentheses
x-3x-13+1=0
We add all the numbers together, and all the variables
-2x-12=0
We move all terms containing x to the left, all other terms to the right
-2x=12
x=12/-2
x=-6
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