2n+21=90

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Solution for 2n+21=90 equation: 



2n+21=90

We move all terms to the left:

2n+21-(90)=0

We add all the numbers together, and all the variables

2n-69=0

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

2n=69

n=69/2

n=34+1/2

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