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12-x-12=16-12
We move all terms to the left:
12-x-12-(16-12)=0
We add all the numbers together, and all the variables
-x+12-12-4=0
We add all the numbers together, and all the variables
-1x-4=0
We move all terms containing x to the left, all other terms to the right
-x=4
x=4/-1
x=-4
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