Question

subtract all two questions

Answer 1

Hey Mate ,

Here is the answer ,
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13.  (3a - 4b - c + 6) - (2a - 5b + 2c - 9)

       => a + b - 3c + 15



14.  (p - 2q - 5r - 8) - (-6p + q + 3r + 8)

       => 7p - 3q - 8r - 16
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