To solve this equation: d/5 + 12 = - 15, which step will be performed last?

Let's go through the steps.

d/5 + 12 = - 15

1. Multiply both sides by 5.

Doing this we get:

d + 60 = - 75

2. Subtract 60 from both sides.

d = - 75 - 60

d = - 135

Step 2 above is the final step taken to find the value of d.