simply n+(m+1)+(n+2)+(m+3)+(n+4)+(m+5)
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Answer:
= 3n + 3m + 15
Step-by-step explanation:
= n+(m+1)+(n+2)+(m+3)+(n+4)+(m+5)
= n+ m+ 1 +n +2 +m+3 + n +4 + m+5
= 3n + 3m + 15
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