Question

22-28d = - 12 ??? geometry is hard

Answer 1

There's not much you can or should do here other than to "solve for d."

Subtract 22 from both sides.  Then 22 - 22 - 28d = -12 - 22 = -34

Then -28d = -34, and d = -28 / (-34) = + 14/17 (answer)