R=a+(k-1)d

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Solution for R=a+(k-1)d equation: 


Simplifying
R = a + (k + -1) * d

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

Reorder the terms for easier multiplication:
R = a + d(-1 + k)
R = a + (-1 * d + k * d)
R = a + (-1d + dk)

Solving
R = a + -1d + dk

Solving for variable 'R'.

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

Simplifying
R = a + -1d + dk

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