7a-7=9a+8

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Solution for 7a-7=9a+8 equation: 



7a-7=9a+8

We move all terms to the left:

7a-7-(9a+8)=0

We get rid of parentheses

7a-9a-8-7=0

We add all the numbers together, and all the variables

-2a-15=0

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

-2a=15

a=15/-2

a=-7+1/2

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