9=4a-9

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Solution for 9=4a-9 equation: 



9=4a-9

We move all terms to the left:

9-(4a-9)=0

We get rid of parentheses

-4a+9+9=0

We add all the numbers together, and all the variables

-4a+18=0

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

-4a=-18

a=-18/-4

a=4+1/2

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