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4x + 20 = 6x - 34
20 + 34 = 6x - 4x
54 = 2x
54
x = ------- = 27
2
sustituimos el valor de x
4(27) + 20 = 6 (27) - 34
108 + 20 = 162 - 34
128 = 128 ⇒ El valor del ángulo es 128º