F(5)=5*5-4

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Solution for F(5)=5*5-4 equation: 


Simplifying
F(5) = 5 * 5 + -4

Reorder the terms for easier multiplication:
5F = 5 * 5 + -4

Multiply 5 * 5
5F = 25 + -4

Combine like terms: 25 + -4 = 21
5F = 21

Solving
5F = 21

Solving for variable 'F'.

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

Divide each side by '5'.
F = 4.2

Simplifying
F = 4.2

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