f(4)=4x+5

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


Simplifying
f(4) = 4x + 5

Reorder the terms for easier multiplication:
4f = 4x + 5

Reorder the terms:
4f = 5 + 4x

Solving
4f = 5 + 4x

Solving for variable 'f'.

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

Divide each side by '4'.
f = 1.25 + x

Simplifying
f = 1.25 + x

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