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16x - 10x - 13 = 8 + 11 + 20---reducimos términos semejantes
6x - 13 = 39---el 13 está son signo negativo pasa con signo positivo
6x = 39 + 13
6x = 52--despejamos x
x = 52/6---simplificamos la mitad
x = 26/3
Solución :
x = 26/3