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olasank [31]
3 years ago
9

I need it fast please

Mathematics
2 answers:
Westkost [7]3 years ago
8 0

Answer:

B. 3m-18n

Step-by-step explanation:

5m+3n-5m+3(m-7n)

=5m+3n-5m+3m-21n

=3m-18n

Arturiano [62]3 years ago
7 0
It’s B.
I have to use 20 characters so....




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