12-4a+8=9+a

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Solution for 12-4a+8=9+a equation: 



12-4a+8=9+a

We move all terms to the left:

12-4a+8-(9+a)=0

We add all the numbers together, and all the variables

-4a-(a+9)+12+8=0

We add all the numbers together, and all the variables

-4a-(a+9)+20=0

We get rid of parentheses

-4a-a-9+20=0

We add all the numbers together, and all the variables

-5a+11=0

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

-5a=-11

a=-11/-5

a=2+1/5

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