Jawabanmu

2014-05-04T09:39:16+07:00
19 - 78 + 53x = 30 + 18x
53x - 18x =30 - 19 + 78
35x = 89
x = 89/35
mungkin gini soalnya
19x -78 + 53x = 30 + 18x
19x - 18x + 53x = 30 + 78
54x = 108
   x = 108/54 = 2

(3x - 2) - (6 - x) = 1
3x - 2 - 6 + x = 1
4x = 1 + 2 + 6
4x = 9
  x = 9/4

12 = -3
y       4
-3y = 48
y = 48/-3
y = -16