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(((12+x)/6) -2)*4 = 12
((2+x/6)-2)*4 = 12
(2-2+x/6)*4 = 12
(x/6)*4 = 12
(4/6) x = 12
x = 12*6/4
x = 72/4
x = 18
El numero es 18
Comprobemoslo:
18+12 = 30
30/6 = 5
5-2 = 3
3*4 = 12
Saludos....