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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 $x$:
$$x = \frac{78}{6}$$
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$x = 13$