a) 6x + 4x + 19 - 169 = 0
10x - 150 = 0
10x = 150
x = 15
б) 7y - 2y + 35 - 95 = 0
5y - 60 = 0
5y = 60
y = 12
в) 7z + 9z - 16 = 160
16z = 176
z = 11
г) 23m - 5m - 18 = 18
18m = 36
m = 2