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Question
Add: a + b - 3, b - a + 3, a - b + 3
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Solution
(a + b - 3) + (b - a + 3) + (a - b + 3)
= a + b - 3 + b - a + 3 + a - b + 3
= a - a + a + b + b - b - 3 + 3 + 3
= a (1 - 1 + 1) + b (1 + 1 - 1) + 3 (-1 + 1 + 1)
= a + b + 3
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