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Explanation:

Step1: Sumar ángulos complementarios

Los ángulos complementarios suman $90^\circ$, así que:
$$(4x + 3) + (2x + 9) = 90$$

Step2: Combinar términos semejantes

Agrupar las variables y las constantes:
$$6x + 12 = 90$$

Step3: Restar 12 a ambos lados

Isolar el término con $x$:
$$6x = 90 - 12$$
$$6x = 78$$

Step4: Dividir entre 6

Calcular el valor de $x$:
$$x = \frac{78}{6}$$

Answer:

$x = 13$