20a-13=20+9a

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Solution for 20a-13=20+9a equation: 



20a-13=20+9a

We move all terms to the left:

20a-13-(20+9a)=0

We add all the numbers together, and all the variables

20a-(9a+20)-13=0

We get rid of parentheses

20a-9a-20-13=0

We add all the numbers together, and all the variables

11a-33=0

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

11a=33

a=33/11

a=3

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