9x + 1 = −80
x = 9
15x = 0
x = 0
15 = 2m + 5
m = 5
9x − 13 = −103
x = -10
−6 + x/4 = −5
x = 4
17x = 204
x = 12
10(k - 9) = -10
k = 8
(x + 5)/6 = 1
x = 1