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Question
Simplify: n + (m + 1) + (n + 2) + (m + 3) + (n + 4) + (m + 5)
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Solution
n + (m + 1) + (n + 2) + (m + 3) + (n + 4) + (m + 5)
= n + m + 1 + n + 2 + m + 3 + n + 4 + m + 5
= n + n + n + m + m + m + 1 + 2 + 3 + 4 + 5
= (1 + 1 + 1)n + (1 + 1 + 1)m + 15
= 3n + 3m + 15
= 3m + 3n + 15
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