Respuesta :

- b = 5

isolate the b by dividing -1 to both sides

-b(/-1) = 5(/-1)
b = 5/ -1
b = -5

b + 20 
(-5) + 20 = 15

15 is your answer

hope this helps
Don’t know the answer choices so the best I could say is “balancing the equation?"

For what it’s worth, the answer is “no solution.” Explanation: The variable cancels out, leaving the equation 20=5, which isn’t true.