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3(7-x)+3x=21
We move all terms to the left:
3(7-x)+3x-(21)=0
We add all the numbers together, and all the variables
3(-1x+7)+3x-21=0
We add all the numbers together, and all the variables
3x+3(-1x+7)-21=0
We multiply parentheses
3x-3x+21-21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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