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x-9/5=21/7+1/7
x-9/5=22/7
x=22/7+9/5
x=110/35+63/35
x=173/35
Comprobación
173/35-9/5=3/1+1/7
173/35-63/35=21/7+1/7
110/35=22/7
Damos quinta a la fracción de la izquierda
22/7=22/7
Respuesta
x=173/35