If d−e = 2d−e , then d is equal to:

d - e = 2d - e      add e to both sides

d - e + e = 2d - e + e

d = 2d      subtract d from both sides

d - d = 2d - d

0 = d

d = 0

D = 0

Step-by-step explanation: D in this case would have to equal 0, because filling in "D" with any number, would make the sides unequal. For example, let's say D = 1 and E = 3, the equation would say "1 - 3 = 2 * 1 - 3". Solving the sides, would leave "-2 = -1", which make it a false answer. Now, let's say D = 0 and E = 3, the equation would say "0 - 3 = 2 * 0 - 3". Solving the sides, would leave "-3 = -3", which is true.

Thus meaning D has to equal 0.

I hope this helps!

Where is the qeustion