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3x- 1/2 = 4/5 ó 3x - 1/2 = -4/5
desarrollando tendremos 2 valores para x, sería:
a) 3x - 1/2 = 4/5
3x = 4/5 + 1/2
3x = 13/10 ------------> x = 13/30
b) 3x- 1/2 = -4/5
3x = 1/2 - 4/5
3x = -3/10 ----------> x = -1/10
por lo tanto, la variable x tomas 2 valores obtenidos lineas arriba