No! 21cc is 21 cubic centimetres and is a measure of volume.
21mg is 21 milligrams (21 thousandths of a gram) and is a measure of weight.
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it is equal to equal lol:P
Yes. If equals are added to equals, then the results of the additions are equal.
it equals 4c
2, which equals 54. 3, which equals 36. 4, which equals 27. 6, which equals 18. 9, which equals 12. 12, which equals 9.