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4=16+x
We move all terms to the left:
4-(16+x)=0
We add all the numbers together, and all the variables
-(x+16)+4=0
We get rid of parentheses
-x-16+4=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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