8a=a+84

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Solution for 8a=a+84 equation: 



8a=a+84

We move all terms to the left:

8a-(a+84)=0

We get rid of parentheses

8a-a-84=0

We add all the numbers together, and all the variables

7a-84=0

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

7a=84

a=84/7

a=12

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