1/2Х+1/3Х+1/4=3/4-1/4Х
1/2x + 1/3x + 1/4 = 3/4 - 1/4x 2/4x + 1/4x + 1/3x = 3/4 - 1/4 3/4x + 1/3x = 1/2 9/12x + 4/12x = 6/12 13x = 6 x = 6/13