an=7+3(n-1)

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Solution for an=7+3(n-1) equation: 


Simplifying
an = 7 + 3(n + -1)

Reorder the terms:
an = 7 + 3(-1 + n)
an = 7 + (-1 * 3 + n * 3)
an = 7 + (-3 + 3n)

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

Solving
an = 4 + 3n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 4n-1 + 3

Simplifying
a = 4n-1 + 3

Reorder the terms:
a = 3 + 4n-1

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