It seems like you've input some mathematical expressions, but they are a little unclear. Let's try to clarify it step by step.
If you're asking to solve the equation \( 5 = 3f + 15 - 15 - 15 \), let's simplify it:
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Start with what you've given: \[ 5 = 3f + 15 - 15 - 15 \]
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Simplify the right side: \[ 5 = 3f + 0 \] This simplifies to: \[ 5 = 3f \]
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Now, divide both sides by 3 to solve for \( f \): \[ f = \frac{5}{3} \]
So the solution to the equation is: \[ f = \frac{5}{3} \]
If this isn't the problem you meant, please clarify, and I'd be happy to help further!