l=(n-1)d+a

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


Simplifying
l = (n + -1) * d + a

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

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

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

Solving
l = a + -1d + dn

Solving for variable 'l'.

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

Simplifying
l = a + -1d + dn

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