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(2x-4)
(2x-4) = 256
(2x-4) 4
(2x-4) = 4 se deduce : 2x-4= 4, entonces x = 4
2)
(x/2-7)
(x/2-7) = 256
(x/2-7)
4
(x/2-7) = 4 se deduce : x/2-7= 4, x/2=11,x=22
3)
7
(3x-2) = 128
7 7
(3x-2) = 2 se deduce : 3x-2=2, 3x=4, x=4/3