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SEAN LOS NÚMEROS CONSECUTIVOS:
X, X + 1; X + 2
PLANTEAMIENTO:
X + 3(X + 2) = 2(X + 1 + 20)
X + 3X + 6 = 2(X + 21)
4X + 6 = 2X + 42
2X = 36
X = 18
LOS NÚMERO SON:
18; 19 Y 20
ESO ES TODO, SALUDOS........