f(x)=5x+4x

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


Simplifying
f(x) = 5x + 4x

Multiply f * x
fx = 5x + 4x

Combine like terms: 5x + 4x = 9x
fx = 9x

Solving
fx = 9x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 9

Simplifying
f = 9

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