A football team took possession of the football on their 20-yard line. In the next three plays, they lost `7` yards, gained `3` yards, and lost `6` yards. On what yard line was the ball at the end of the three plays?

yard line

Box 1: Enter your answer as an integer or decimal number. Examples: 3, -4, 5.5172
Enter DNE for Does Not Exist, oo for Infinity