2n+21=189

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Solution for 2n+21=189 equation: 



2n+21=189

We move all terms to the left:

2n+21-(189)=0

We add all the numbers together, and all the variables

2n-168=0

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

2n=168

n=168/2

n=84

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