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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