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