1/3x÷12+2/3x÷30+0.5=3/5x÷12+2/5x÷30
化简后得
1/36x+1/45x+0.5=1/20x+1/75x
再化简得
1/20x+0.5=19/300x
19/300x-1/20x=0.5
1/75x=1/2
x=1/2÷1/75
x=37.5