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3(2i-7)=6i-21
We move all terms to the left:
3(2i-7)-(6i-21)=0
We multiply parentheses
6i-(6i-21)-21=0
We get rid of parentheses
6i-6i+21-21=0
We add all the numbers together, and all the variables
=0
i=0/1
i=0
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