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Edad de Roberto = x
2x + 2 + x = 26
2x + x + 2 = 26
3x + 2 = 26
3x = 26 - 2
3x = 24
x = 24/3
x = 8
2x + 2 = 2 (8) + 2 = 16 + 2 = 18
Solución :
Marta tiene = 18 años
Roberto tiene = 8 años