Which of the following steps is involved in solving 3 x plus 8 equals 14 ?

A. 3 x plus 8 minus 8 equals 14

B. 3 x plus 8 equals 14 minus 8

C. 3 x plus 8 plus 8 equals 14 plus 8

D. 3 x plus 8 minus 8 equals 14 minus 8