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