3(21+n)=12

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Solution for 3(21+n)=12 equation: 



3(21+n)=12

We move all terms to the left:

3(21+n)-(12)=0

We add all the numbers together, and all the variables

3(n+21)-12=0

We multiply parentheses

3n+63-12=0

We add all the numbers together, and all the variables

3n+51=0

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

3n=-51

n=-51/3

n=-17

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