2n+(-9)=-3

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Solution for 2n+(-9)=-3 equation: 



2n+(-9)=-3

We move all terms to the left:

2n+(-9)-(-3)=0

We add all the numbers together, and all the variables

2n-6=0

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

2n=6

n=6/2

n=3

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