Respuesta :

Annyohasayo

Answer:

[tex]5x + 12 = 2x + 21 \\ 5x - 2x = 21 - 12 \\ 3x = 9 \\ x = \frac{9}{3} \\ x = 3[/tex]

Step-by-step explanation:

please mark me brainliest

manissaha129

Answer:

[tex]5x + 12 = 2x + 21 \\ 5x - 2x = 21 - 12 \\ 3x = 9 \\ x = \frac{9}{3}\\ \boxed{x = 3}[/tex]

  • x = 3 is the right answer.