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La séptima parte = x/6
Dos terceras partes = 2x/3
Resolvemos :
x/7 +2x/3 = 51
(3x +14x)/21 = 51
17x /21 = 51
17x = 51 (21)
17x = 1071
x = 1071/17
x = 63
Solución : El numero es 63