20=3-7a

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Solution for 20=3-7a equation: 



20=3-7a

We move all terms to the left:

20-(3-7a)=0

We add all the numbers together, and all the variables

-(-7a+3)+20=0

We get rid of parentheses

7a-3+20=0

We add all the numbers together, and all the variables

7a+17=0

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

7a=-17

a=-17/7

a=-2+3/7

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