6a+7=9a-8

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Solution for 6a+7=9a-8 equation: 



6a+7=9a-8

We move all terms to the left:

6a+7-(9a-8)=0

We get rid of parentheses

6a-9a+8+7=0

We add all the numbers together, and all the variables

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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