F(x)=21

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Solution for F(x)=21 equation: 


Simplifying
F(x) = 21

Multiply F * x
xF = 21

Solving
xF = 21

Solving for variable 'x'.

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

Divide each side by 'F'.
x = 21F-1

Simplifying
x = 21F-1

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