3 целых2/5*(9х+0.8)-15.17=24.27

3 2/5 * (9х + 0,8) - 15,17 = 24,273,4 * (9х + 0,8) = 24,27 +15,173,4 * (9х + 0,8) = 39,449х + 0,8 = 11,69х = 11,6 - 0,89х = 10,8х = 10,8 / 9х = 1,2