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3x-84=4x+16
We move all terms to the left:
3x-84-(4x+16)=0
We get rid of parentheses
3x-4x-16-84=0
We add all the numbers together, and all the variables
-1x-100=0
We move all terms containing x to the left, all other terms to the right
-x=100
x=100/-1
x=-100
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