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kipiarov [429]
3 years ago
10

-9 + x =12 what is x?

Mathematics
2 answers:
dolphi86 [110]3 years ago
3 0

Answer:

x = 21

Step-by-step explanation:

-9 + x = 12

+9         +9

x=21

seropon [69]3 years ago
3 0
X is 21 because we need at least 9 to get it back to zero because it’s a positive number then add 12 because that the number you need to get to and 21-9= 12
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