18=30-6a

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Solution for 18=30-6a equation: 



18=30-6a

We move all terms to the left:

18-(30-6a)=0

We add all the numbers together, and all the variables

-(-6a+30)+18=0

We get rid of parentheses

6a-30+18=0

We add all the numbers together, and all the variables

6a-12=0

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

6a=12

a=12/6

a=2

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