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7(-8n+3)=21-56n
We move all terms to the left:
7(-8n+3)-(21-56n)=0
We add all the numbers together, and all the variables
7(-8n+3)-(-56n+21)=0
We multiply parentheses
-56n-(-56n+21)+21=0
We get rid of parentheses
-56n+56n-21+21=0
We add all the numbers together, and all the variables
=0
n=0/1
n=0
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