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entonces planteando el problema sería:
2a+a/2 = 414
2a=4a/2 (Esto es para igualar denominador y poder sumar)
(4a+a)/2=414
5a=414x2
5a=828
Por lo tanto a=828/5
2x+x/2=414
5x/2=414
5x=828
x=828/5