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c)
-2k+6=18
-2k=18-6
-2k=12 /:(-2)
k=-6
d)
-5z-3=22
-5z=22+3
-5z=25 /:(-5)
z=-5
e)
9z-8=5z
9z-5z=8
4z=8 /:4
z=2
f)
s+4=-3s
s+3s=-4
4s=-4 /:4
s=-1