a=0.9a

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Solution for a=0.9a equation: 



a=0.9a

We move all terms to the left:

a-(0.9a)=0

We add all the numbers together, and all the variables

a-(+0.9a)=0

We get rid of parentheses

a-0.9a=0

We add all the numbers together, and all the variables

0.1a=0

a=0/0.1

a=0

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