2/3x+1/6x=1/4 4x+x=3/2 5x=3/2 x=3/10 x-7/9x=5/12 2/9x=5/12 x=15/8 x+3/4x=140 7/4x=140 x=80 3/5x+20=50 3/5x=30 x=50
