30=4a-12+2a

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Solution for 30=4a-12+2a equation: 



30=4a-12+2a

We move all terms to the left:

30-(4a-12+2a)=0

We add all the numbers together, and all the variables

-(6a-12)+30=0

We get rid of parentheses

-6a+12+30=0

We add all the numbers together, and all the variables

-6a+42=0

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

-6a=-42

a=-42/-6

a=+7

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