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Question
How much smaller is 15x – 18y + 19z than 22x – 20y – 13z + 26 ?
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Solution
The required result is
(22x – 20y – 13z + 26) – (15x – 18y + 19z)
= 22x – 20y – 13z + 26 – 15x + 18y – 19z
= 7x – 2y – 32z + 26
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