A12=-7+5(n-1)

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Solution for A12=-7+5(n-1) equation: 



12=-7+5(A-1)

We move all terms to the left:

12-(-7+5(A-1))=0



We calculate terms in parentheses: -(-7+5(A-1)), so:

-7+5(A-1)

determiningTheFunctionDomain
5(A-1)-7

We multiply parentheses

5A-5-7

We add all the numbers together, and all the variables

5A-12

Back to the equation:

-(5A-12)



We get rid of parentheses

-5A+12+12=0

We add all the numbers together, and all the variables

-5A+24=0

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

-5A=-24

A=-24/-5

A=4+4/5

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