A=5x-15,B=2x+21

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Solution for A=5x-15,B=2x+21 equation: 



=5A-15.=2A+21

We move all terms to the left:

-(5A-15.)=0

We add all the numbers together, and all the variables

-(5A-15)=0

We get rid of parentheses

-5A+15=0

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

-5A=-15

A=-15/-5

A=+3

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