(5x-0.3)/0.4=(3x-1.2)/0.6-(1.8-8x)/1.2 两边乘1.23（5x-0.3）=2(3x-1.2)-(1.8-8x)15x-0.9=6x-2.4-1.8+8x15x-0.9=14x-4.215x-14x=0.9-4.2x=-3.3
3.3
