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-45=12+x
We move all terms to the left:
-45-(12+x)=0
We add all the numbers together, and all the variables
-(x+12)-45=0
We get rid of parentheses
-x-12-45=0
We add all the numbers together, and all the variables
-1x-57=0
We move all terms containing x to the left, all other terms to the right
-x=57
x=57/-1
x=-57
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