3(n+19)=87

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Solution for 3(n+19)=87 equation: 



3(n+19)=87

We move all terms to the left:

3(n+19)-(87)=0

We multiply parentheses

3n+57-87=0

We add all the numbers together, and all the variables

3n-30=0

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

3n=30

n=30/3

n=10

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