9) 20 + 30k = 20 + k30k = k29k = 0k = 0
16) -9n + 3 = 3(8n + 45)-9n + 3 = 24n + 135-9n - 24n = 135 - 3-33n = 132n = -4
22) 8y + 12 = 12 + y8y - y = 12 - 127y = 0y = 0
26) 18 + 16k = 18 + k16k - k = 18 - 1815k = 0k = 0
27) 5(x - 6) - 2 = 2(x - 7) - 65x - 30 - 2 = 2x - 14 - 65x - 32 = 2x - 205x - 2x = -20 + 323x = 12x = 4
9) 20 + 30k = 20 + k
30k = k
29k = 0
k = 0
16) -9n + 3 = 3(8n + 45)
-9n + 3 = 24n + 135
-9n - 24n = 135 - 3
-33n = 132
n = -4
22) 8y + 12 = 12 + y
8y - y = 12 - 12
7y = 0
y = 0
26) 18 + 16k = 18 + k
16k - k = 18 - 18
15k = 0
k = 0
27) 5(x - 6) - 2 = 2(x - 7) - 6
5x - 30 - 2 = 2x - 14 - 6
5x - 32 = 2x - 20
5x - 2x = -20 + 32
3x = 12
x = 4