3a+12=8a-18

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Solution for 3a+12=8a-18 equation: 



3a+12=8a-18

We move all terms to the left:

3a+12-(8a-18)=0

We get rid of parentheses

3a-8a+18+12=0

We add all the numbers together, and all the variables

-5a+30=0

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

-5a=-30

a=-30/-5

a=+6

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