n + (2 x 3) = 21
Therefore, n = 21 - (2 x 3)
n = 15
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273 13+8 = 21 and 13*21 = 273
(25 +21) * 2 = 92 25 + (21 * 2) = 67
C+ (-2)= 21= 21+2= 23+ (-2)= 21 23+ (-2)= 21 is the same as 23- 2= 21
2
26 - 21 = 5 or 24 - 23 = 1