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-21=3(-7+n)
We move all terms to the left:
-21-(3(-7+n))=0
We add all the numbers together, and all the variables
-(3(n-7))-21=0
We calculate terms in parentheses: -(3(n-7)), so:We get rid of parentheses
3(n-7)
We multiply parentheses
3n-21
Back to the equation:
-(3n-21)
-3n+21-21=0
We add all the numbers together, and all the variables
-3n=0
n=0/-3
n=0
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