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11=12+x
We move all terms to the left:
11-(12+x)=0
We add all the numbers together, and all the variables
-(x+12)+11=0
We get rid of parentheses
-x-12+11=0
We add all the numbers together, and all the variables
-1x-1=0
We move all terms containing x to the left, all other terms to the right
-x=1
x=1/-1
x=-1
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