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27-5= 22/2 =11
el numero es 11
2x + 5 = 27
2x = 27 - 5
2x = 22
x = 22/2
x= 11
el num es 11
comprobar
2x+5=27
2*11+5 = 27
22+5 = 27
27=27
el num pensado es el num 11