Respuesta :

Answer:

x = 2

Step-by-step explanation:

[tex]x \times 21 = 14 \times (x + 1) \\ 21x = 14x + 14 \\ 21x - 14x = 14 \\ 7x = 14 \\ x = \frac{14}{7} \\ x = 2[/tex]