n=a+(b-1)d

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


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

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

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

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

Solving
n = a + bd + -1d

Solving for variable 'n'.

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

Simplifying
n = a + bd + -1d

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