an=3+7x(n-1)

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


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

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

Reorder the terms:
an = 3 + (7nx + -7x)
an = 3 + (7nx + -7x)

Solving
an = 3 + 7nx + -7x

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 3n-1 + 7x + -7n-1x

Simplifying
a = 3n-1 + 7x + -7n-1x

Reorder the terms:
a = 3n-1 + -7n-1x + 7x

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