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4x-28+7=4x-21
We move all terms to the left:
4x-28+7-(4x-21)=0
We add all the numbers together, and all the variables
4x-(4x-21)-21=0
We get rid of parentheses
4x-4x+21-21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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