b=a+(n-1)d

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


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

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

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

Solving
b = a + -1d + dn

Solving for variable 'b'.

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

Simplifying
b = a + -1d + dn

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