2/5x-5=0.3(x-5)0.4x-5=0.3x-1.50.4x-0.3x=-1.5+50.1x=3.5∴x=35
解:2x-25=1.5(x-5)2x-25=1.5x-7.52x-1.5x=-7.5+250.5x=17.5x=35