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Wiki User
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Manley Zboncak ∙
Fifteen plus six equals twenty-one (21).
15 + (-6) = 9
1.5 + 6 = 7.5
-6 plus 15 plus 15 is equal to 24.
-9
-6 + 15 = 9
8 plus 7 is 15. 15 plus 6 is 21. :)
15 x 6 or the long way is 90
-12 + 6 - 10 - 6 +15 = -7
[(15 + 6) ÷ 3] + 10 (6 - 3) =
15 - 7 + 6 is 14
8 plus 15 = 23
72
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