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18:3=6
6-2=4
El número es 4
x + 2 = (x + 2)
al resultado lo multiplico por tres se obtiene dieciocho
(x + 2) × 3 = 18
3 (x + 2) = 18
3x + 6 = 18
3x = 18 - 6
3x = 12
x = 12/3
x = 4
saludos :)