12a+9=11a-18

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Solution for 12a+9=11a-18 equation: 



12a+9=11a-18

We move all terms to the left:

12a+9-(11a-18)=0

We get rid of parentheses

12a-11a+18+9=0

We add all the numbers together, and all the variables

a+27=0

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

a=-27

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