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6+x+6=2x-6
We move all terms to the left:
6+x+6-(2x-6)=0
We add all the numbers together, and all the variables
x-(2x-6)+12=0
We get rid of parentheses
x-2x+6+12=0
We add all the numbers together, and all the variables
-1x+18=0
We move all terms containing x to the left, all other terms to the right
-x=-18
x=-18/-1
x=+18
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