an=4n+(n-1)d

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Solution for an=4n+(n-1)d equation: 


Simplifying
an = 4n + (n + -1) * d

Reorder the terms:
an = 4n + (-1 + n) * d

Reorder the terms for easier multiplication:
an = 4n + d(-1 + n)
an = 4n + (-1 * d + n * d)
an = 4n + (-1d + dn)

Reorder the terms:
an = -1d + dn + 4n

Solving
an = -1d + dn + 4n

Solving for variable 'a'.

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

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

Simplifying
a = -1dn-1 + d + 4

Reorder the terms:
a = 4 + d + -1dn-1

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