17x - 34 = 170
17x = 170 + 34
17x = 204
x = 12
7x + 5 = 9x - 11
5 + 11 = 9x - 7x
16 = 2x
x = 8
5(x - 6) = 15(x - 8)
5x - 30 = 15x - 120
120 - 30 = 15x - 5x
90 = 10x
x = 9
-1/3 * y - 1 = 2/6 * y
-1/3 * y - 1 = 1/3 * y
-1 = 1/3 * y + 1/3 * y
-1 = 2/3 * y
y = -3/2