9=a-3a

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Solution for 9=a-3a equation: 



9=a-3a

We move all terms to the left:

9-(a-3a)=0

We add all the numbers together, and all the variables

-(-2a)+9=0

We get rid of parentheses

2a+9=0

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

2a=-9

a=-9/2

a=-4+1/2

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