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