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16x=4x-84
We move all terms to the left:
16x-(4x-84)=0
We get rid of parentheses
16x-4x+84=0
We add all the numbers together, and all the variables
12x+84=0
We move all terms containing x to the left, all other terms to the right
12x=-84
x=-84/12
x=-7
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