Which of the following is not equivalent to this expression?

2m + 10m + 14 + 3
A. m + 12m + 8 + 9
B. 2m + 10 + 10m + 7
C. 6т + 6m - 1 + 18
D. 15m + 15 - 3m + 2

C. 6т + 6m - 1 + 18