A(n)=3n-6

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Solution for A(n)=3n-6 equation: 



(A)=3A-6

We move all terms to the left:

(A)-(3A-6)=0

We get rid of parentheses

A-3A+6=0

We add all the numbers together, and all the variables

-2A+6=0

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

-2A=-6

A=-6/-2

A=+3

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