12=1+1a

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Solution for 12=1+1a equation: 



12=1+1a

We move all terms to the left:

12-(1+1a)=0

We add all the numbers together, and all the variables

-(a+1)+12=0

We get rid of parentheses

-a-1+12=0

We add all the numbers together, and all the variables

-1a+11=0

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

-a=-11

a=-11/-1

a=+11

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