f(x)=90

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Solution for f(x)=90 equation: 


Simplifying
f(x) = 90

Multiply f * x
fx = 90

Solving
fx = 90

Solving for variable 'f'.

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

Divide each side by 'x'.
f = 90x-1

Simplifying
f = 90x-1

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