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x/12 - (2x+4)/5 = 0; multiplicando toda la ec por 60
5x - 12(2x+4) = 0
5x - 24x-48 = 0
-19x = 48
x = - 48/19 = 2 10/19( en mixto)
SEGUNDO EJERCICIO
3x - 2x/5 = x/10 -7/4 (multiplicando todo por 20)
60x - 8x = 2x - 35
60x - 8x - 2x = -35
50x = -35
x = -35/50 (sacando la quinta)
x = - 7/10