7a+-7a+-3a+9a=-12

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Solution for 7a+-7a+-3a+9a=-12 equation: 



7a+-7a+-3a+9a=-12

We move all terms to the left:

7a+-7a+-3a+9a-(-12)=0

We add all the numbers together, and all the variables

6a=0

a=0/6

a=0

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