6n+9=-3n+21+6

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Solution for 6n+9=-3n+21+6 equation: 



6n+9=-3n+21+6

We move all terms to the left:

6n+9-(-3n+21+6)=0

We add all the numbers together, and all the variables

6n-(-3n+27)+9=0

We get rid of parentheses

6n+3n-27+9=0

We add all the numbers together, and all the variables

9n-18=0

We move all terms containing n to the left, all other terms to the right

9n=18

n=18/9

n=2

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