20=a-5a

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Solution for 20=a-5a equation: 



20=a-5a

We move all terms to the left:

20-(a-5a)=0

We add all the numbers together, and all the variables

-(-4a)+20=0

We get rid of parentheses

4a+20=0

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

4a=-20

a=-20/4

a=-5

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