10a-20=9a+1

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Solution for 10a-20=9a+1 equation: 



10a-20=9a+1

We move all terms to the left:

10a-20-(9a+1)=0

We get rid of parentheses

10a-9a-1-20=0

We add all the numbers together, and all the variables

a-21=0

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

a=21

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