f(4)=4*4-15

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Solution for f(4)=4*4-15 equation: 


Simplifying
f(4) = 4 * 4 + -15

Reorder the terms for easier multiplication:
4f = 4 * 4 + -15

Multiply 4 * 4
4f = 16 + -15

Combine like terms: 16 + -15 = 1
4f = 1

Solving
4f = 1

Solving for variable 'f'.

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

Divide each side by '4'.
f = 0.25

Simplifying
f = 0.25

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