What is 29+d=54; 24,25,26, how do i solve it?

To solve these types of problems, write it out.

29+d=54
-29    -29    subtract 29 from both sides because you want the constants                     (numbers) on one side and the variable on the other
d= 25

DO THE SAME THING WITH ALL THE OTHER NUMBERS
 you should get d= 25, -5, -4, -3

If you need an equation, it would be y=2x+8, y would be how long it grew, x being weeks.if you need how long he was asleep, it would be 4 weeks if he started with no beard, the equation would be x=8÷2if he did have a beard before hand, the equation would be 2w+x=8