f=2r-4

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Solution for f=2r-4 equation: 


Simplifying
f = 2r + -4

Reorder the terms:
f = -4 + 2r

Solving
f = -4 + 2r

Solving for variable 'f'.

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

Simplifying
f = -4 + 2r

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