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x²+3x-108=0
Descomponer a 108
108|2
54|2
27|3
9|3
3|3
1
12×9=108
12-9=3
(x+12)(x-9)=0
x+12=0
x=-12
x-9=0
x=9
R//Conjunto solución :[-12,9]
Espero que sirva!Saludos!