Sum of the columns are
Sum of column 1
A + D + G = 30.47
Sum of column 2
B + E + H = 18.9565
Sum of column 3
C + F + I = 26
sum of the columns are not the same.
How the values for each variable is calculated.
For A
4(2x -7)-2x = -10
8x - 28 - 2x = -10
6x = 18
x = 18/6 = 3
For B
3.3(n-8)-n = 1.2
3.3n - 26.4 - n = 1.2
2.3n = 25.2
n = 25.2/2.3 = 10.9565
For C
12 + 1/5(10c + 5) = 59
60 + (10c + 5) = 295
10c = 295 - 65
10c = 230
c = 230/10 = 23
For D
8.6w + 2.2(2w - 5) = 54
8.6w + 4.4w - 11 = 54
4.2w -11 = 54
4.2w = 65
w = 65/4.2 = 15.4762
For E
1/3(21y + 39) = -36
21y + 39 = -108
21y = -147
y = -147/21
y = 7
For F
5/4(20z + 12) = -35
5(20z + 12) = -140
100z + 60 = -140
100z = 200
z = 200/100 = 2
For G
1/2v -12 + 20 = 14
1/2v = 6
v = 12
For H
1.4(x + 5) + 1.6x = 52
1.4x + 7 + 1.6x = 52
2x = 45
x = 45/2 = 22.5
For I
-12 = 19k - 4k + 3
15k = -15
k = -15/15 = 1
Sum of column 1
A + D + G
= 3 + 15.4762 + 12 = 30.47
Sum of column 2
B + E + H
10.9565 + 7 + 1 = 18.9565
Sum of column 3
C + F + I
23 + 2 + 1 = 26