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12-(x+3)-10=0
We add all the numbers together, and all the variables
-(x+3)+2=0
We get rid of parentheses
-x-3+2=0
We add all the numbers together, and all the variables
-1x-1=0
We move all terms containing x to the left, all other terms to the right
-x=1
x=1/-1
x=-1
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