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-9z+1z=7-6
-8z=1|:(-8)
z=-1/8
b)25m-3=24m-4
25m-24m=3-4
m=1
c)-s+15=4s-14
-s-4s=-14-15
-5s=-29|:(-5)
s=5,8
d)17y+28=19y+27
17y-19y=27-28
-2y=-1|:(-2)
y=1/2
e)8k-19=-8k+19
8k+8k=19+19
16k=38|:16
k=2,38