f(4)=8x-x

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Solution for f(4)=8x-x equation: 


Simplifying
f(4) = 8x + -1x

Reorder the terms for easier multiplication:
4f = 8x + -1x

Combine like terms: 8x + -1x = 7x
4f = 7x

Solving
4f = 7x

Solving for variable 'f'.

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

Divide each side by '4'.
f = 1.75x

Simplifying
f = 1.75x

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