30+15+3n=7n-21

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Solution for 30+15+3n=7n-21 equation: 



30+15+3n=7n-21

We move all terms to the left:

30+15+3n-(7n-21)=0

We add all the numbers together, and all the variables

3n-(7n-21)+45=0

We get rid of parentheses

3n-7n+21+45=0

We add all the numbers together, and all the variables

-4n+66=0

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

-4n=-66

n=-66/-4

n=16+1/2

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