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-9=x+3=8
We move all terms to the left:
-9-(x+3)=0
We get rid of parentheses
-x-3-9=0
We add all the numbers together, and all the variables
-1x-12=0
We move all terms containing x to the left, all other terms to the right
-x=12
x=12/-1
x=-12
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