-9=a-11+12

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Solution for -9=a-11+12 equation: 



-9=a-11+12

We move all terms to the left:

-9-(a-11+12)=0

We add all the numbers together, and all the variables

-(a+1)-9=0

We get rid of parentheses

-a-1-9=0

We add all the numbers together, and all the variables

-1a-10=0

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

-a=10

a=10/-1

a=-10

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