D/14=7
Since you're dividing "D" with 14, you got to multiply 14 on each side to isolate D.
14•D/14=7(14)
Now since you are multiplying and dividing 14 on the left side of the equation, they cancel out to equal one. So it should look like this:
1•D=7(14)
Now you multiply the 7 & 14 and it comes out to be 98. So,
D=98