3=20-a

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Solution for 3=20-a equation: 



3=20-a

We move all terms to the left:

3-(20-a)=0

We add all the numbers together, and all the variables

-(-1a+20)+3=0

We get rid of parentheses

1a-20+3=0

We add all the numbers together, and all the variables

a-17=0

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

a=17

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