Respuesta:
x²+9x+x+9= x²+8x-1
10x-8x= -1-9
2x= -10
x= -10/2
x= -5
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Respuesta:
x²+9x+x+9= x²+8x-1
10x-8x= -1-9
2x= -10
x= -10/2
x= -5