Demonstrate how you can add two numbers together to get zero. Does this work for all numbers? What is this relationship called?
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81 houses total.
of 81 (27) sold last month.
81 - 27 = 54 houses remaining.
of 54 (36) sold this month.
54 - 36 = 18 houses remaining.
There are 18 houses left to be sold.
81 - 27 = 54 houses remaining.
54 - 36 = 18 houses remaining.
There are 18 houses left to be sold.