12a-40=5a+9

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Solution for 12a-40=5a+9 equation: 



12a-40=5a+9

We move all terms to the left:

12a-40-(5a+9)=0

We get rid of parentheses

12a-5a-9-40=0

We add all the numbers together, and all the variables

7a-49=0

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

7a=49

a=49/7

a=7

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