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B = {c-6;c+6}
C = {-1;b+7}
Luego:
3b - 13 = -1
3b = -1 + 13
3b = 12
b = 12/3
b = 4
a² + 2 = b + 7
a² + 2 = (4) + 7
a² + 2 = 11
a² = 11 - 2
a² = 9
a = √9
a = 3
c - 6 = -1
c = -1 + 6
c = 5
Por lo tanto:
a + b + c
= (3) + (4) + (5)
= 12
Respuesta = 12