f(4)=4.5*4+9

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Solution for f(4)=4.5*4+9 equation: 


Simplifying
f(4) = 4.5 * 4 + 9

Reorder the terms for easier multiplication:
4f = 4.5 * 4 + 9

Multiply 4.5 * 4
4f = 18 + 9

Combine like terms: 18 + 9 = 27
4f = 27

Solving
4f = 27

Solving for variable 'f'.

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

Divide each side by '4'.
f = 6.75

Simplifying
f = 6.75

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