7z - 3 = 11 + 3z ie 7z -3z = 11 + 3 4z = 14 z = 3.5 Check: (7 x 3.5) - 3; 11 + (3 x 3.5) 24.5 - 3 = 11 + 10.5 21.5 = 21.5 QED
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It works out that: z = -32
The ordered triple is (x, y, z) = (1, -1, -2)
(5z + 9)(3z - 2)
True
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