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-2k=18-6
-2k=12/:(-2)
k=(-6)
-5z-3=22
-5z=22+3
-5z=25/ ;(-5)
z=(-20)
9z-8=52
9z=52+8/:9
z=6.6
y = 18
-2k = 12
k = -6
-5z = 25
z = -5
4z = 8
z = 2
4s = -4
s = -1