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)

Multiply a * d
b = ad(-1 + n)
b = (-1 * ad + n * ad)
b = (-1ad + adn)

Solving
b = -1ad + adn

Solving for variable 'b'.

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

Simplifying
b = -1ad + adn

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