Answer:
-12
Step-by-step explanation:
15 - 12 = 3
3 - 12 = -9
(-9) - (-12) = -21
and so on.
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Answers & Comments
Answer:
-12
Step-by-step explanation:
15 - 12 = 3
3 - 12 = -9
(-9) - (-12) = -21
and so on.