10,15(х-4)=9,9-0,3(х-1)

10,15(х-4)=9,9-0,3(х-1)10,15х-40,6=9,9-0,3х+1,310,15х+0,3х=9,9+1,3+40,610,45х=51,8х=51,8/10,45=5180/1045х=4 1000/1045=4 200/209Ответ:4 200/209.