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x + 2/3 x = 51
sabemos que
3/3 = 1
1x = x, entonces
x = 3/3 x
3/3x + 2/3 x = 51
5/3x = 51
x = 51*3/5
x = 153/5
x = 30.6
El número es 30.6
Veamos si cumple con las condicionantes (comprobar)
30.6 + 2/3 *30.6 = 51
30.6 + 61.2 /3 = 51
30.6 +20.4 = 51
51 = 51
Saludos...