решить уравнения 25 + (х-2) * 15=70 72: (12-х: 4) = 9

1) 25 + (х - 2) * 15 = 70

25 + 15 х - 30 = 70

15 х = 70 - 25 + 30

15 х = 75

х = 5

2) 72 / (12 - х / 4) = 9

72 / ((48 - х) / 4) = 9

72 * (4 / 48 - х) = 9

288 / (48 - х) = 9

48 - х = 288 / 9

48 - х = 32

- х = 32 - 48

- х = - 16

х = 16 можно проще

72 / (12 - х / 4) = 9

12 - х / 4 = 72 / 9

12 - х / 4 = 8

- х / 4 = 8 - 12

- х / 4 = - 4

х / 4 = 4

х = 4 * 4

х = 16