f(x)=-x+5x-4y

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Solution for f(x)=-x+5x-4y equation: 


Simplifying
f(x) = -1x + 5x + -4y

Multiply f * x
fx = -1x + 5x + -4y

Combine like terms: -1x + 5x = 4x
fx = 4x + -4y

Solving
fx = 4x + -4y

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 4 + -4x-1y

Simplifying
f = 4 + -4x-1y

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