Номер 721

1) 1376 : (34 – х) = 86

34 – х = 1376 : 86

34 – х = 16

х = 34 – 16

х = 18

2) 9680 : (х + 219) = 16

х + 219 = 9680 : 16

х + 219 = 605

х = 605 – 219

х = 386

3) (х – 57) : 29 = 205

х – 57 = 205 • 29

х – 57 = 5945

х = 5945 + 57

х = 6002

4) (х – 72) • 9 = 927

х – 72 = 927 : 9

х – 72 = (900 + 27) : 9

х – 72 = 103

х = 103 + 72

х = 175