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Question
Add: ab - 4a, 4b - ab, 4a - 4b
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Solution
(ab - 4a) + (4b - ab) + (4a - 4b)
= ab - 4a + 4b - ab + 4a - 4b
= ab - ab - 4a + 4a + 4b - 4b
= ab (1 - 1) + a (- 4 + 4) + b(4 - 4)
= 0
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