Respuesta:
[tex]x + x - 10 = 70 \\ 2x = 70 + 10 \\ 2x = 80 \\ x = \frac{80}{2 } \\ x = 40 \\ el \: otro \: libro \: vale \: 30 \\ [/tex]
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Respuesta:
[tex]x + x - 10 = 70 \\ 2x = 70 + 10 \\ 2x = 80 \\ x = \frac{80}{2 } \\ x = 40 \\ el \: otro \: libro \: vale \: 30 \\ [/tex]