f(x)=ln(4-x)

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


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

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

Solving
fx = 4ln + -1lnx

Solving for variable 'f'.

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

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

Simplifying
f = 4lnx-1 + -1ln

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

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