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If (x+y)^2-z^2=4,\ \ (y+z)^2-x^2=9,\ \ (...

If `(x+y)^2-z^2=4,\ \ (y+z)^2-x^2=9,\ \ (z+x)^2-y^2=36` , what is/are the value(s) of `x+y+z` ? (a) 0 (b) `+-1` (c) `+-3` (d) `+-7`

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