21=-9+6n

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Solution for 21=-9+6n equation:



21=-9+6n
We move all terms to the left:
21-(-9+6n)=0
We add all the numbers together, and all the variables
-(6n-9)+21=0
We get rid of parentheses
-6n+9+21=0
We add all the numbers together, and all the variables
-6n+30=0
We move all terms containing n to the left, all other terms to the right
-6n=-30
n=-30/-6
n=+5

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