f(x)=2x+4

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Solution for f(x)=2x+4 equation: 


Simplifying
f(x) = 2x + 4

Multiply f * x
fx = 2x + 4

Reorder the terms:
fx = 4 + 2x

Solving
fx = 4 + 2x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 4x-1 + 2

Simplifying
f = 4x-1 + 2

Reorder the terms:
f = 2 + 4x-1

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