f(3)=20

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Solution for f(3)=20 equation: 


Simplifying
f(3) = 20

Reorder the terms for easier multiplication:
3f = 20

Solving
3f = 20

Solving for variable 'f'.

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

Divide each side by '3'.
f = 6.666666667

Simplifying
f = 6.666666667

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