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* significa al cuadrado
a.b = -12 a+b = -1
a= -12/b -12/b + b = -1
b* - 12 = -b
b* + b -12 = o
b = 3 ò -4
entoces a : -4 ò 3
posibles valores a= -4 b= 3
a= 3 b= -4