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makvit [3.9K]
3 years ago
13

I need help i am very confused

Mathematics
1 answer:
sasho [114]3 years ago
5 0

9+12=m or 9+12=21

this is because when we start with m-9=12 we know that m is supposed to be the sum of 9 and 12.

if we check our work we will see this

9+12=21

9+12=21

m-9=12

21-9=12

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