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

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



We calculate terms in parentheses: -((-1A)+(A+20)), so:

(-1A)+(A+20)

We get rid of parentheses

-1A+A+20

We add all the numbers together, and all the variables

20

Back to the equation:

-(20)



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

=20

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