Question 13005
2d + 24 + 3d =84 (Solving for d, meaning get "d" completely alone)

First, combine like terms.  d's and whole numbers.
2d+3d=5d

Second, Subtract 24 since it is on the wrong side and a positive number and take it to the 84.  The 24 becomes negative because it was subtracted.  Now you must subtract 24 from 84 which leaves you 60.
5d=60

Third, divide both sides by 5.
5d/5=60/5

d=12
Hope that helped.