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1. 3d -9 = 10d + 5
3d -10d = 5 +9
-7d = 14
d = -2
2. n = 9 (8+n)
n = 72 +9n
n - 9n = 72
n = 72/ -8
n = -9
3. 3t + 4 = 2t + 22
3t - 2t = 22 - 4
t = 18
3d-10d=9+5
-7d=14
d=14/-7
d=-2
2. n/ (8+ n) =9
n = 9(8+n)
n = 72+9n
n-9n = 72
-8n = 72
n = 72/-8
n = -9
3. 3t+4=2t+22
3t-2t=-4+22
t = 18