A(n)=A(n-1)-4

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Solution for A(n)=A(n-1)-4 equation: 



(A)=(A-1)-4

We move all terms to the left:

(A)-((A-1)-4)=0



We calculate terms in parentheses: -((A-1)-4), so:

(A-1)-4

We get rid of parentheses

A-1-4

We add all the numbers together, and all the variables

A-5

Back to the equation:

-(A-5)



We get rid of parentheses

A-A+5=0

We add all the numbers together, and all the variables

5!=0

There is no solution for this equation

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