Step-by-step explanation: The coefficient of a variable is the number multiplying it. To factor it, take the coefficient out and put it outside the parantheses. However, if you do that, make sure you take that coefficient out of all of your other terms!
Think about before the 12 campers got off the bus. So, in addition to 27 campers that stayed inside the bus (12+27), it would equal 39 campers in total.
