30=18-3n

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Solution for 30=18-3n equation: 



30=18-3n

We move all terms to the left:

30-(18-3n)=0

We add all the numbers together, and all the variables

-(-3n+18)+30=0

We get rid of parentheses

3n-18+30=0

We add all the numbers together, and all the variables

3n+12=0

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

3n=-12

n=-12/3

n=-4

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