6n+3n=-9

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



6n+3n=-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

9n+9=0

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

9n=-9

n=-9/9

n=-1

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