20=4-1a

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Solution for 20=4-1a equation: 



20=4-1a

We move all terms to the left:

20-(4-1a)=0

We add all the numbers together, and all the variables

-(-1a+4)+20=0

We get rid of parentheses

1a-4+20=0

We add all the numbers together, and all the variables

a+16=0

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

a=-16

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