Respuesta:
[tex] \frac{9}{3} = \frac{15 + 9}{3 + x} \\multiplicacion \: cruzada \\ 9(3 + x) = 3(24) \\ 27 + 9x = 72 \\ restar \: 27 \\ 9x = 72 - 27 \\ 9x = 45 \\ divdir \: 9 \\ x = \frac{45}{9} \\ x = 5[/tex]
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Respuesta:
[tex] \frac{9}{3} = \frac{15 + 9}{3 + x} \\multiplicacion \: cruzada \\ 9(3 + x) = 3(24) \\ 27 + 9x = 72 \\ restar \: 27 \\ 9x = 72 - 27 \\ 9x = 45 \\ divdir \: 9 \\ x = \frac{45}{9} \\ x = 5[/tex]