2a-9a=12-9a

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Solution for 2a-9a=12-9a equation: 



2a-9a=12-9a

We move all terms to the left:

2a-9a-(12-9a)=0

We add all the numbers together, and all the variables

2a-9a-(-9a+12)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

-7a+9a-12=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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