Question

How do you solve 3d+d-7=25/4

Answer 1

First you add 3d to d so you gonna have 4d and after that you can add 7 on both sides so you gonna have : 4d = 25/4 + 7 ⇒ 4d = 25/4 + 28/4 ⇒ 4d = 53/4 now you can multiply the both sides by 1/4 so you gonna have : d = 53/16 ⇒ d = 3.31 :))
i hope this is helpful 
have a nice day 

Answer 2

3d + d -7 = 25/4

4d - 7 = 25/4  (combined like terms)

4d - 7 + 7 = 25/4 + 7 (add 7 to both sides)

4d = 53/4

d = 53/4  ÷ 4 (did the inverse operation of d)

d = 53/16   or    d = 3.31