f(9)=81-9+1

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Solution for f(9)=81-9+1 equation: 


Simplifying
f(9) = 81 + -9 + 1

Reorder the terms for easier multiplication:
9f = 81 + -9 + 1

Combine like terms: 81 + -9 = 72
9f = 72 + 1

Combine like terms: 72 + 1 = 73
9f = 73

Solving
9f = 73

Solving for variable 'f'.

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

Divide each side by '9'.
f = 8.111111111

Simplifying
f = 8.111111111

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