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5-(8+x)=12
We move all terms to the left:
5-(8+x)-(12)=0
We add all the numbers together, and all the variables
-(x+8)+5-12=0
We add all the numbers together, and all the variables
-(x+8)-7=0
We get rid of parentheses
-x-8-7=0
We add all the numbers together, and all the variables
-1x-15=0
We move all terms containing x to the left, all other terms to the right
-x=15
x=15/-1
x=-15
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