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1 solution
The number system works with the upright triangle representing 1, right-pointing triangle as 3 and left-pointing triangle as 9. If the 1-triangle and 3-triangle are not in the 1-3-9-triangle order, they are assigned a negative values of -1 and -3 respectively. This is shown in the table below.
According to this number system, the two numbers and their sum are: 1 1 + 1 3 = 2 4 .