f(x)=4-5

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Solution for f(x)=4-5 equation: 


Simplifying
f(x) = 4 + -5

Multiply f * x
fx = 4 + -5

Combine like terms: 4 + -5 = -1
fx = -1

Solving
fx = -1

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -1x-1

Simplifying
f = -1x-1

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