4+0.8a=0.90a

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Solution for 4+0.8a=0.90a equation: 



4+0.8a=0.90a

We move all terms to the left:

4+0.8a-(0.90a)=0

We add all the numbers together, and all the variables

0.8a-(+0.90a)+4=0

We get rid of parentheses

0.8a-0.90a+4=0

We add all the numbers together, and all the variables

-0.1a+4=0

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

-0.1a=-4

a=-4/-0.1

a=+40

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