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Question
Add: t - 8tz, 3tz - z, z - t
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Solution
(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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