9a+7=12a+15

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Solution for 9a+7=12a+15 equation: 



9a+7=12a+15

We move all terms to the left:

9a+7-(12a+15)=0

We get rid of parentheses

9a-12a-15+7=0

We add all the numbers together, and all the variables

-3a-8=0

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

-3a=8

a=8/-3

a=-2+2/3

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