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Step1: Usar la suma de ángulos internos de un triángulo
La suma de los ángulos internos de un triángulo es \(180^{\circ}\). Entonces, \(x + 20+74 = 180\).
Step2: Resolver para \(x\)
Simplificar la ecuación: \(x+94 = 180\). Restar 94 de ambos lados: \(x=180 - 94\).
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\(x = 86\)