Respuesta :

Space

Answer:

r = -20/9

Step-by-step explanation:

Step 1: Write out equation

3(4 + 6r) = -28

Step 2: Distribute 3

12 + 18r = -28

Step 3: Subtract 12 on both sides

18r = -40

Step 4: Divide both sides by 18

r = -20/9