An=3-4(n-1)

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Solution for An=3-4(n-1) equation: 


Simplifying
An = 3 + -4(n + -1)

Reorder the terms:
nA = 3 + -4(-1 + n)
nA = 3 + (-1 * -4 + n * -4)
nA = 3 + (4 + -4n)

Combine like terms: 3 + 4 = 7
nA = 7 + -4n

Solving
nA = 7 + -4n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '4n' to each side of the equation.
4n + nA = 7 + -4n + 4n

Combine like terms: -4n + 4n = 0
4n + nA = 7 + 0
4n + nA = 7

Reorder the terms:
-7 + 4n + nA = 7 + -7

Combine like terms: 7 + -7 = 0
-7 + 4n + nA = 0

The solution to this equation could not be determined.

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