Respuesta :

vivihuerta07

Answer:

d=7-2/3f

Step-by-step explanation:

Move the variable to the right-hand side and change its sign- 3d=21-2f

Divide both sides of the equation by 3- d=7-2/3f

Write the solution d in parametric form- d=7-2/3f

Solution- d=7-2/3f