-a=a-9

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Solution for -a=a-9 equation: 



-a=a-9

We move all terms to the left:

-a-(a-9)=0

We add all the numbers together, and all the variables

-1a-(a-9)=0

We get rid of parentheses

-1a-a+9=0

We add all the numbers together, and all the variables

-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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