Respuesta :

aravdev

Answer:

7

Step-by-step explanation:

20 - 12 = 8

15 - b = 8

-b = 8 - 15

b = 7 ( -ve signs will become +ve)

lilshorty03
b = 15 - (20 - 12)
b = 15 - 8
b = 7

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