Kak tolong jawab no 12 bagian b

* 6 - 2a = - 2
6 - 2a - 6 = -2 - 6
-2a = -8
a = -8/-2
a = 4

* 4 - (5 - b) = 6
4 - 5 + b = 6
- 1 + b = 6
-1 + b + 1 = 6 + 1
b = 7

* 0 - (3c + 2) = -8
-3c - 2 = - 8
-3c -2 + 2 = - 8 + 2
-3c = -6
c = -6/-3
c = 2

* untuk b = 7, disubtitusi pada persamaan
-1 - (b + 2d) = 8
- 1 - b - 2d = 8
-1 - (7) - 2d = 8
-8 - 2d = 8
-8 - 2d + 8 = 8 + 8
-2d = 16
d = 16/-2
d = -8