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3x+21=6x-28
We move all terms to the left:
3x+21-(6x-28)=0
We get rid of parentheses
3x-6x+28+21=0
We add all the numbers together, and all the variables
-3x+49=0
We move all terms containing x to the left, all other terms to the right
-3x=-49
x=-49/-3
x=16+1/3
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