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7/10x-x/2=12
para restar, multiplico por 5 al numerador y denominador de la segunda fracción
7/10x-5*x/5*2=12
7/10x-5/10x=12
(7x-5x)/10=12
(2x)/10=12
2x=12*10
2x=120
x=120/2
x=60
respuesta la E