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