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4-(x+12)=45
We move all terms to the left:
4-(x+12)-(45)=0
We add all the numbers together, and all the variables
-(x+12)-41=0
We get rid of parentheses
-x-12-41=0
We add all the numbers together, and all the variables
-1x-53=0
We move all terms containing x to the left, all other terms to the right
-x=53
x=53/-1
x=-53
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