a=(n-1)d

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Solution for a=(n-1)d equation: 


Simplifying
a = (n + -1) * d

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

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

Solving
a = -1d + dn

Solving for variable 'a'.

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

Simplifying
a = -1d + dn

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