f(x)=-x+9x

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Solution for f(x)=-x+9x equation: 


Simplifying
f(x) = -1x + 9x

Multiply f * x
fx = -1x + 9x

Combine like terms: -1x + 9x = 8x
fx = 8x

Solving
fx = 8x

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 8

Simplifying
f = 8

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