8a-40=9a-47

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Solution for 8a-40=9a-47 equation: 



8a-40=9a-47

We move all terms to the left:

8a-40-(9a-47)=0

We get rid of parentheses

8a-9a+47-40=0

We add all the numbers together, and all the variables

-1a+7=0

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

-a=-7

a=-7/-1

a=+7

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