21.9=0.15a

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Solution for 21.9=0.15a equation: 



21.9=0.15a

We move all terms to the left:

21.9-(0.15a)=0

We add all the numbers together, and all the variables

-(+0.15a)+21.9=0

We get rid of parentheses

-0.15a+21.9=0

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

-0.15a=-21.9

a=-21.9/-0.15

a=+146

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