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21+1n=7(1n-3)
We move all terms to the left:
21+1n-(7(1n-3))=0
We add all the numbers together, and all the variables
1n-(7(n-3))+21=0
We add all the numbers together, and all the variables
n-(7(n-3))+21=0
We calculate terms in parentheses: -(7(n-3)), so:We get rid of parentheses
7(n-3)
We multiply parentheses
7n-21
Back to the equation:
-(7n-21)
n-7n+21+21=0
We add all the numbers together, and all the variables
-6n+42=0
We move all terms containing n to the left, all other terms to the right
-6n=-42
n=-42/-6
n=+7
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