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a)8x+5=7x
8x-7x=-5
x=-5
b)7n+2=6n-3
7n-6n=-3-2
n=-5
c)-x+25=2x-2
-x-2x=-2-25
x+2x=2+25
3x=27
x=9
d)-9z-7=-z-6
-9z+z=-6+7
-8z=1
8z=-1
z=1/8
e)25m-3=24m-4
25m-24m=-4+3
m=-1
f)-s+15=4s-14
-s-4s=-14-15
-5s=-29
5s=29
s=5,8
g)17y+28=19y+27
17y-19y=27-28
-2y=-1
2y=1
y=0,5
h)8k-19=-85+19
8k=-85+19+19
8k=-85+38
8k=-47
k=5,875