fy(x)=2x+y

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Solution for fy(x)=2x+y equation: 


Simplifying
fy(x) = 2x + y

Multiply fy * x
fxy = 2x + y

Solving
fxy = 2x + y

Solving for variable 'f'.

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

Divide each side by 'xy'.
f = 2y-1 + x-1

Simplifying
f = 2y-1 + x-1

Reorder the terms:
f = x-1 + 2y-1

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