Suppose point D is in the interior of ∠ABC, m∠ABC=12x−110, m∠ABD=3x+40, and m∠DBC=2x−10. What is the m∠ABC?

"I was 10 or 12 years old and in Philadelphia on holiday with the family. We were going to the car to go celebrate my birthday. The car is parked on the side of the road and I had to get in on the driver side due to the passenger door not working. I regrettably was wearing dress shoes and I learned real quick that dress shoes and icy roads don't mix.

"I slipped and fell right on my back. I was going to get up but saw a car coming. I didn’t react fast enough and the car ran right over my foot and the rear tire rested on top of my foot.

"Now you can imagine the sound a child would make getting their foot run over, but me, I got it run over three times. The driver freaked out and popped the car in reverse and then the front tire was resting on my foot (more screaming from me) and then rolled forward.

"Luckily, at the hospital, the doctor said my foot was saved by the shoe because the dress shoe was a size too small. My parents joked about it, saying ‘So what do you think of your birthday gift?’ I was on crutches for two weeks and [am now walking just fine]."