A=45-3x

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Solution for A=45-3x equation: 



=45-3A

We move all terms to the left:

-(45-3A)=0

We add all the numbers together, and all the variables

-(-3A+45)=0

We get rid of parentheses

3A-45=0

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

3A=45

A=45/3

A=15

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