Add: T − 8tz, 3tz − Z, Z − T

Add: t - 8tz, 3tz - z, z - t

(t - 8tz) + (3tz - z) + (z - t) = t - 8tz + 3tz - z + z - t

= t - t - 8tz + 3tz - z + z

= t (1 - 1) + tz (-8 + 3) + z (-1 + 1)

= -5tz

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