A=-49+21x

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Solution for A=-49+21x equation: 



=-49+21A

We move all terms to the left:

-(-49+21A)=0

We add all the numbers together, and all the variables

-(21A-49)=0

We get rid of parentheses

-21A+49=0

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

-21A=-49

A=-49/-21

A=2+1/3

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