A=(10+1r)+(20+-1r)

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Solution for A=(10+1r)+(20+-1r) equation: 



=(10+1A)+(20+-1A)

We move all terms to the left:

-((10+1A)+(20+-1A))=0

We add all the numbers together, and all the variables

-((A+10)+(-1A))=0



We calculate terms in parentheses: -((A+10)+(-1A)), so:

(A+10)+(-1A)

We get rid of parentheses

A-1A+10

We add all the numbers together, and all the variables

10

Back to the equation:

-(10)



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

=10

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