0=2a+7a

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Solution for 0=2a+7a equation: 



0=2a+7a

We move all terms to the left:

0-(2a+7a)=0

We add all the numbers together, and all the variables

-(+9a)+0=0

We add all the numbers together, and all the variables

-(+9a)=0

We get rid of parentheses

-9a=0

a=0/-9

a=0

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