A=3x+400

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Solution for A=3x+400 equation: 



=3A+400

We move all terms to the left:

-(3A+400)=0

We get rid of parentheses

-3A-400=0

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

-3A=400

A=400/-3

A=-133+1/3

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