f(x)=(x+4)-25

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Solution for f(x)=(x+4)-25 equation: 


Simplifying
f(x) = (x + 4) + -25

Multiply f * x
fx = (x + 4) + -25

Reorder the terms:
fx = (4 + x) + -25

Remove parenthesis around (4 + x)
fx = 4 + x + -25

Reorder the terms:
fx = 4 + -25 + x

Combine like terms: 4 + -25 = -21
fx = -21 + x

Solving
fx = -21 + x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = -21x-1 + 1

Simplifying
f = -21x-1 + 1

Reorder the terms:
f = 1 + -21x-1

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