exam Maths Puzzle Numerical Ability

The density of copper is 8.92 g/cm3. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?

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D = C-s/N (for s)

I have searched throughout the chapter for a process to solve this literal equation. I do not understand how to handle the fraction in the middle. what is the value of p in 6p-7=2p+9 and how did you get that answer?