Oh, isn't that a happy little question! When you add Z plus Z, you're essentially combining two Z's together, just like painting two lovely trees side by side. So, Z plus Z equals 2Z, creating a beautiful harmony on your mathematical canvas. Just remember, there are no mistakes in math, only happy little accidents!
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9z-5z = 30+z 3z = 30 z = 10
z remains undefined.
y=84-72=12 z=84-52=32 x=84-12-32=40
Z2 - 5Z + 4 = 0 (Z- 1)(Z - 4) so, Z = 1 ---------- and Z = 4 -----------
(1/x) + (1/y) + (1/z) is a minimum value when x=y=z=10. Symmetry gives either maximum or minimum value.