12=a+6-1

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Solution for 12=a+6-1 equation: 



12=a+6-1

We move all terms to the left:

12-(a+6-1)=0

We add all the numbers together, and all the variables

-(a+5)+12=0

We get rid of parentheses

-a-5+12=0

We add all the numbers together, and all the variables

-1a+7=0

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

-a=-7

a=-7/-1

a=+7

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