an=7+2(n-1)

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Solution for an=7+2(n-1) equation: 


Simplifying
an = 7 + 2(n + -1)

Reorder the terms:
an = 7 + 2(-1 + n)
an = 7 + (-1 * 2 + n * 2)
an = 7 + (-2 + 2n)

Combine like terms: 7 + -2 = 5
an = 5 + 2n

Solving
an = 5 + 2n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 5n-1 + 2

Simplifying
a = 5n-1 + 2

Reorder the terms:
a = 2 + 5n-1

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