83=20+9a

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Solution for 83=20+9a equation: 



83=20+9a

We move all terms to the left:

83-(20+9a)=0

We add all the numbers together, and all the variables

-(9a+20)+83=0

We get rid of parentheses

-9a-20+83=0

We add all the numbers together, and all the variables

-9a+63=0

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

-9a=-63

a=-63/-9

a=+7

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