3 целых 2/5*(9х+0,8)-15,17=24,27

2/5*(9х+0,8)-15,17=24,270,4*(9х+0,8)=24,27+15,170,4(9х+8)=39,449х+0,8=39,44:0,49х+0,8=98,69х=98,6-0,89х=97,8х=10 13/152/5*(9*10 13/15+0,8)-15,17=2/4*(9*10 13/15=97,8+0,8=98,6*2/5(0,4)39,44-15,17=24,27