A) 2 97 =2k) - 4 ( -7+ 1/2 k) = -19
21 + 6k + 28 - 2k =-19
49 + 4k = -19
4k = -19 - 49
4k = - 68
k = -17
b) 5 ( 2x - 12) - 3/2 * (12x+11) = 1.5
10x - 60 - 18x - 33/2 = 1.5
-8x - 60 - 33/2 = 1.5
-8x- 76.5 = 1.5
- 8x = 1.5 + 76.5
-8x = 78
x = - 78 / 8
x = - 39 / 4
x = - 9 3/4 ( минус девять целых три четвертых)
x = - 9.75