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6(x-7)+21=6x-21
We move all terms to the left:
6(x-7)+21-(6x-21)=0
We multiply parentheses
6x-(6x-21)-42+21=0
We get rid of parentheses
6x-6x+21-42+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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