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42+12=x-12+12
We move all terms to the left:
42+12-(x-12+12)=0
We add all the numbers together, and all the variables
-(+x)+42+12=0
We add all the numbers together, and all the variables
-(+x)+54=0
We get rid of parentheses
-x+54=0
We add all the numbers together, and all the variables
-1x+54=0
We move all terms containing x to the left, all other terms to the right
-x=-54
x=-54/-1
x=+54
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