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12=-x+23
We move all terms to the left:
12-(-x+23)=0
We add all the numbers together, and all the variables
-(-1x+23)+12=0
We get rid of parentheses
1x-23+12=0
We add all the numbers together, and all the variables
x-11=0
We move all terms containing x to the left, all other terms to the right
x=11
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