f(x)=4ln(20-x)

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Solution for f(x)=4ln(20-x) equation: 


Simplifying
f(x) = 4ln(20 + -1x)

Multiply f * x
fx = 4ln(20 + -1x)
fx = (20 * 4ln + -1x * 4ln)
fx = (80ln + -4lnx)

Solving
fx = 80ln + -4lnx

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 80lnx-1 + -4ln

Simplifying
f = 80lnx-1 + -4ln

Reorder the terms:
f = -4ln + 80lnx-1

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