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680=4x+16
We move all terms to the left:
680-(4x+16)=0
We get rid of parentheses
-4x-16+680=0
We add all the numbers together, and all the variables
-4x+664=0
We move all terms containing x to the left, all other terms to the right
-4x=-664
x=-664/-4
x=+166
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