6n-21=3+6

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Solution for 6n-21=3+6 equation: 



6n-21=3+6

We move all terms to the left:

6n-21-(3+6)=0

We add all the numbers together, and all the variables

6n-21-9=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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