A(2x+3)=9x+12x

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Solution for A(2x+3)=9x+12x equation: 



(2A+3)=9A+12A

We move all terms to the left:

(2A+3)-(9A+12A)=0

We add all the numbers together, and all the variables

(2A+3)-(+21A)=0

We get rid of parentheses

2A-21A+3=0

We add all the numbers together, and all the variables

-19A+3=0

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

-19A=-3

A=-3/-19

A=3/19

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