12-(a-1)=11+a

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Solution for 12-(a-1)=11+a equation: 



12-(a-1)=11+a

We move all terms to the left:

12-(a-1)-(11+a)=0

We add all the numbers together, and all the variables

-(a-1)-(a+11)+12=0

We get rid of parentheses

-a-a+1-11+12=0

We add all the numbers together, and all the variables

-2a+2=0

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

-2a=-2

a=-2/-2

a=1

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