Respuesta:
b =1
Explicación paso a paso:
21b - 12= b + 8
21b - b= 8 + 12
20b = 20
b = 1
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Respuesta:
b =1
Explicación paso a paso:
21b - 12= b + 8
21b - b= 8 + 12
20b = 20
b = 1