f(4)=3x-8

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Solution for f(4)=3x-8 equation: 


Simplifying
f(4) = 3x + -8

Reorder the terms for easier multiplication:
4f = 3x + -8

Reorder the terms:
4f = -8 + 3x

Solving
4f = -8 + 3x

Solving for variable 'f'.

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

Divide each side by '4'.
f = -2 + 0.75x

Simplifying
f = -2 + 0.75x

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