解：4.5x+4.5*6=5x-5*0.4 4.5x+27=5x-2 5x-4.5x=27+2 0.5x=29 x=58
4.5x+2.7=5x-2-0.5x=-4.7x=47/5
4.5x+2.7=5x-20.5x=4.7x=9.4
