3a-9a=-4a=0

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Solution for 3a-9a=-4a=0 equation: 



3a-9a=-4a=0

We move all terms to the left:

3a-9a-(-4a)=0

We add all the numbers together, and all the variables

-6a-(-4a)=0

We get rid of parentheses

-6a+4a=0

We add all the numbers together, and all the variables

-2a=0

a=0/-2

a=0

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