Решите уравнения: 1) 0.3 (0.4 х - 1.2,) + 0.36 х = 34 2) 8 (х - 7) - 3 (2 х + 9) = 15 3) 0.15 (у - 4) = 9.9 - 0.3 (у-1)

1) 0.3 (0.4 х - 1.2,) + 0.36 х = 34

0.3 * 0.4 х - 1.2 * 0.3 + 0.36 х = 34

0.12 х - 0.36 + 0.36 х = 34

0.12 х + 0.36 х = 34 + 0.36

0.48 х = 34.36

х = 34.36 / 0.48

х = 3436 / 48

2) 8 (х - 7) - 3 (2 х + 9) = 15

8 * х - 7 * 8 - 3 (2 х + 9) = 15

8 х - 56 - 3 * 2 х + 9 * (-3) = 15

8 х - 56 - 6 х - 27 = 15

8 х - 83 - 6 х = 15

8 х - 6 х = 15 + 83

2 х = 98

х = 98 / 2

х = 49