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14+9x=256-717x
14-256= -717x-9x
-242/-726=x
1/3=x
comprobacion:
14-12(1/3)+39(1/3)-18(1/3)=256-60(1/3)-657(1/3)
14-12/3+39/3-18/3= 256-60/3-657/3
14-4+13-6=256-20-219
17=17