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x+3+x+3+x+3=x+x+x+x
We move all terms to the left:
x+3+x+3+x+3-(x+x+x+x)=0
We add all the numbers together, and all the variables
x+x+x-(+4x)+3+3+3=0
We add all the numbers together, and all the variables
3x-(+4x)+9=0
We get rid of parentheses
3x-4x+9=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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