self Maths Puzzle

x^2 = Y + z
y^2 = x+ z
z^2 = Y + x

find the value of 1/x + 1/y + 1/z . the answer should be a definite value..

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self Other Question

if 8+12 = 2
7+14 = 3

Find the value of 10+18 = ?
Find the units digit of 2483^(122!).