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

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



=2A-15+=2A+21

We move all terms to the left:

-(2A-15+)=0

We add all the numbers together, and all the variables

-(+2A)=0

We get rid of parentheses

-2A=0

A=0/-2

A=0

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