12=20-a

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Solution for 12=20-a equation: 



12=20-a

We move all terms to the left:

12-(20-a)=0

We add all the numbers together, and all the variables

-(-1a+20)+12=0

We get rid of parentheses

1a-20+12=0

We add all the numbers together, and all the variables

a-8=0

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

a=8

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