S=n(n+1)9

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Solution for S=n(n+1)9 equation: 


Simplifying
S = n(n + 1) * 9

Reorder the terms:
S = n(1 + n) * 9

Reorder the terms for easier multiplication:
S = 9n(1 + n)
S = (1 * 9n + n * 9n)
S = (9n + 9n2)

Solving
S = 9n + 9n2

Solving for variable 'S'.

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

Simplifying
S = 9n + 9n2

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