A=20-x(x)

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Solution for A=20-x(x) equation: 



=20-A(A)

We move all terms to the left:

-(20-A(A))=0

We add all the numbers together, and all the variables

-(-AA+20)=0

We get rid of parentheses

AA-20=0

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

AA=20

A=20/1

A=20

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