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How do you correctly use units when writing derivatives and functions in math?

Example

A car goes 17miles per gallon, so a function m with the equation m(g)=17g describes the distance it can go with g gallons.

And the derivative dm/dg = 17 miles/gallon.

Question: could you write the equation as m(g)=17(miles/gallon)*g or is that incorrect?

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# Mixing units with functions or derivatives?

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