1=9+4a

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Solution for 1=9+4a equation: 



1=9+4a

We move all terms to the left:

1-(9+4a)=0

We add all the numbers together, and all the variables

-(4a+9)+1=0

We get rid of parentheses

-4a-9+1=0

We add all the numbers together, and all the variables

-4a-8=0

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

-4a=8

a=8/-4

a=-2

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