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3(x-21)-6=3x-69
We move all terms to the left:
3(x-21)-6-(3x-69)=0
We multiply parentheses
3x-(3x-69)-63-6=0
We get rid of parentheses
3x-3x+69-63-6=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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