6x - 5 = 31
x = 4
11x - 80 = 8
7x - 18 = 10
x = 7
6x - 7 = 5
x = 1/2
5x + 4 = 19
x = 3
x = 1
2x + 7 = 17
x = 8
3x + 9 = 30
3x = 2
x = 5
2x = 1
x = 6
9x + 1 = 10
x = 2/3
x = 2
