8/5 *х²-20/9 *х+72/25 *х-4=7/3 *х²-50/9 *х +42/25 *х-4
8/5 *х²-20/9 *х+72/25 *х=7/3 *х²-50/9 *х +42/25 *х
8/5 *х²+148/225 *х=7/3 *х²-872/225 *х
8/5 *х²+148/225 *х-7/3 *х²+872/225 *х=0
-11/15 *х²+68/15 *х=0
-1/15 *х*(11х-68)=0
х(11х-68)=0
х=0 11х-68=0
11х=68
х= 6 8/11
Ответ: х1=0
х2=6 8/11