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n^2=4+5
n^2=9
aplicamos raiz cuadrada a ambos terminos
n=3 y n=-3
8b^2-7=193
8b^2=193+7
8b^2=200
b^2=200/8
b^2=25
aplicamos raiz cuadrada a ambos terminos
b=5 y b=-5
saludos