A=2a+(n-2)d

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Solution for A=2a+(n-2)d equation: 


Simplifying
A = 2a + (n + -2) * d

Reorder the terms:
A = 2a + (-2 + n) * d

Reorder the terms for easier multiplication:
A = 2a + d(-2 + n)
A = 2a + (-2 * d + n * d)
A = 2a + (-2d + dn)

Solving
A = 2a + -2d + dn

Solving for variable 'A'.

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

Simplifying
A = 2a + -2d + dn

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