28d + 15 = 25d +33
Subtract 25d on both sides.
28d+15−25d=33
Combine 28d and −25d to get 3d.
3d+15=33
Subtract 15 from both sides.
3d=33−15
Subtract 15 from 33 to get 18.
3d=18
Divide both sides by 3.
d = 18/3
Divide 18 by 3 to get 6.
d=6
Is d = 4 a solution to the equation 28d + 15 = 25d +33?
Seeing as the answer is d=6, then the answer is not d=4. Therefore it is false.
Michael Spymore