0.4x＝0.5x＋4000.5x-0.4x=-4000.1x=-400x=-4000
0.4x＝0.5x＋4000.4x-0.5x=400-0.1x＝400x＝-4000
0.4x＝0.5x＋400—0.1×=400×=-4000
-4000
