8n + 7 = 31
(v + 9 )\3 = 8
9x − 7 = −7
−9x − 13 = −103
2(n + 5) = −2
−9x + 1 = −80
9 + 9n = 9
144 = −12(x + 5)
−15 = −4m + 5
6 = a/4 + 2
10 − 6v = −104