A=(x1-4*5)

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Solution for A=(x1-4*5) equation: 



=(A1-4*5)

We move all terms to the left:

-((A1-4*5))=0

We add all the numbers together, and all the variables

-((A-20))=0



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

(A-20)

We get rid of parentheses

A-20

Back to the equation:

-(A-20)



We get rid of parentheses

-A+20=0

We add all the numbers together, and all the variables

-1A+20=0

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

-A=-20

A=-20/-1

A=+20

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