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Vlada [557]
3 years ago
11

Sum of a number x and three is twelve

Mathematics
2 answers:
krek1111 [17]3 years ago
6 0
If you mean this: 
x + 3 = 12 

then for finding the answer you should just put -3 on both sides and you will get 9 for your answer! 

Happy Thanksgiving :) 
sergejj [24]3 years ago
4 0
1)12-3=9
2)you need to check it so
3)9+3=12
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