chemistry

Suppose a piece of lead with a mass of 14.9g at a temperature of 92.5c is dropped into an insulated container of water. The mass of water is 165g and its temperature before adding the lead is 20.0c. What is the final temperature of the system?

The sum of the heats gained is zero (some will absorb heat)
Heatgainedlead + heatgained water=0
ml*cl*(Tf-92.5) + mw*Cw*(Tf-20)=0
solve for Tf.

i don't understand

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