Respuestas

2013-10-09T22:40:52+02:00
X - 3/4 x - 1/3 ( x-3/4 x) = 30
x - 3x/4 -x/3+3/4x = 30;
12x -9x -4x + 9x = 360 ;
8x = 360;
x = 45