9a+12=-8a+-7

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Solution for 9a+12=-8a+-7 equation: 



9a+12=-8a+-7

We move all terms to the left:

9a+12-(-8a+-7)=0

We add all the numbers together, and all the variables

9a-(-8a-7)+12=0

We get rid of parentheses

9a+8a+7+12=0

We add all the numbers together, and all the variables

17a+19=0

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

17a=-19

a=-19/17

a=-1+2/17

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