20=2-1a

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Solution for 20=2-1a equation: 



20=2-1a

We move all terms to the left:

20-(2-1a)=0

We add all the numbers together, and all the variables

-(-1a+2)+20=0

We get rid of parentheses

1a-2+20=0

We add all the numbers together, and all the variables

a+18=0

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

a=-18

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