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x + x/2 + x/4 = 2x -4
(1 + 1/2 + 1/4)x = 2x -4
(4/4 + 2/4 + 1/4)x = 2x -4
(7/4)x - (2)x = -4
(7/4 - 8/4)x = -4
(-1/4)x= -4
Multiplicando por -4 en ambos lados
x = 16
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