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x=-84+4x
We move all terms to the left:
x-(-84+4x)=0
We add all the numbers together, and all the variables
x-(4x-84)=0
We get rid of parentheses
x-4x+84=0
We add all the numbers together, and all the variables
-3x+84=0
We move all terms containing x to the left, all other terms to the right
-3x=-84
x=-84/-3
x=+28
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