Решим каждое уравнение по порядку:
1. 1 - 2(5 + 3x) = 15
1 - 10 - 6x = 15
-9 - 6x = 15
-6x = 15 + 9
-6x = 24
x = 24 / (-6)
x = -4
2. 8 - 5(8 + 3x) = 13
8 - 40 - 15x = 13
-32 - 15x = 13
-15x = 13 + 32
-15x = 45
x = 45 / (-15)
x = -3
3. 2 - 3(7 + 2x) = 11
2 - 21 - 6x = 11
-19 - 6x = 11
-6x = 11 + 19
-6x = 30
x = 30 / (-6)
x = -5
4. 2 - 3(2 + 3x) = 14
2 - 6 - 9x = 14
-4 - 9x = 14
-9x = 14 + 4
-9x = 18
x = 18 / (-9)
x = -2
5. x - 2(3x + 2) = 16
x - 6x - 4 = 16
-5x - 4 = 16
-5x = 16 + 4
-5x = 20
x = 20 / (-5)
x = -4
6. 3x - 2(3x + 4) = 10
3x - 6x - 8 = 10
-3x - 8 = 10
-3x = 10 + 8
-3x = 18
x = 18 / (-3)
x = -6
7. 2x - 3(3x + 1) = 11
2x - 9x - 3 = 11
-7x - 3 = 11
-7x = 11 + 3
-7x = 14
x = 14 / (-7)
x = -2
8. 3x - 2(3x - 2) = 19
3x - 6x + 4 = 19
-3x + 4 = 19
-3x = 19 - 4
-3x = 15
x = 15 / (-3)
x = -5
9. -4x = 15 - 3(3x - 5)
-4x = 15 - 9x + 15
-4x = 30 - 9x
-4x + 9x = 30
5x = 30
x = 30 / 5
x = 6
10. -7x = 13 - 2(8x - 7)
-7x = 13 - 16x + 14
-7x = 27 - 16x
-7x + 16x = 27
9x = 27
x = 27 / 9
x = 3
11. -5x = 11 - 2(4x - 2)
-5x = 11 - 8x + 4
-5x = 15 - 8x
-5x + 8x = 15
3x = 15
x = 15 / 3
x = 5
12. 7 - 3(5x - 3) = -11x
7 - 15x + 9 = -11x
16 - 15x = -11x
16 = -11x + 15x
16 = 4x
x = 16 / 4
x = 4
13. 16 - 7(5 - x) = 9
16 - 35 + 7x = 9
-19 + 7x = 9
7x = 9 + 19
7x = 28
x = 28 / 7
x = 4