Respuesta :

Answer:

b = 11

Step-by-step explanation:

b + 7 + 12 = 30

b + 19 = 30

b = 11

Can I get brainliest

Answer: 11

Step-by-step explanation:

write a equivalent expression b+19=30

subtract 19 from both sides b+19-19=30-19

b=11