f(x)=3x+y

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Solution for f(x)=3x+y equation: 


Simplifying
f(x) = 3x + y

Multiply f * x
fx = 3x + y

Solving
fx = 3x + y

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 3 + x-1y

Simplifying
f = 3 + x-1y

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