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How to do this problem, about mathematics, in seconds.
For example, x, glasses y, necklace z.

According to the first formula 3x+z=23.

By the second formula x+y-y/y=9

By the third formula z+yz=24

This equation group has two sets of solutions.

x= 12,y=-2,z=- 13

Or x=6, y=4 and z=5.

Then x+y+z = -3 or x+y+z = 15.