4a+18=9a-12

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Solution for 4a+18=9a-12 equation: 



4a+18=9a-12

We move all terms to the left:

4a+18-(9a-12)=0

We get rid of parentheses

4a-9a+12+18=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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