C=7n+2(n-1)

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Solution for C=7n+2(n-1) equation: 


Simplifying
C = 7n + 2(n + -1)

Reorder the terms:
C = 7n + 2(-1 + n)
C = 7n + (-1 * 2 + n * 2)
C = 7n + (-2 + 2n)

Reorder the terms:
C = -2 + 7n + 2n

Combine like terms: 7n + 2n = 9n
C = -2 + 9n

Solving
C = -2 + 9n

Solving for variable 'C'.

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

Simplifying
C = -2 + 9n

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