28.5=3a+9

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Solution for 28.5=3a+9 equation: 



28.5=3a+9

We move all terms to the left:

28.5-(3a+9)=0

We get rid of parentheses

-3a-9+28.5=0

We add all the numbers together, and all the variables

-3a+19.5=0

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

-3a=-19.5

a=-19.5/-3

a=6+1/2

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