12=a-1

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Solution for 12=a-1 equation: 



12=a-1

We move all terms to the left:

12-(a-1)=0

We get rid of parentheses

-a+1+12=0

We add all the numbers together, and all the variables

-1a+13=0

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

-a=-13

a=-13/-1

a=+13

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