- 9 * (8 - 9х) = 4х + 5
- 72 + 81х = 4х + 5
81х - 4х = 5 + 72
77х = 77
х = 77 : 77
х = 1
- 9 * (8 - 9 * 1) = 4 * 1 + 5
- 9 * (8 - 9) = 4 + 5
- 9 * (- 1) = 9
9 = 9
- 9 * (8 - 9х) = 4х + 5
- 72 + 81х = 4х + 5
81х - 4х = 5 + 72
77х = 77
х = 77 : 77
х = 1
- 9 * (8 - 9 * 1) = 4 * 1 + 5
- 9 * (8 - 9) = 4 + 5
- 9 * (- 1) = 9
9 = 9