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25m= 24m-1 | -24m
1m=1
b)-s +15=4s-14 | +s
15= 5s-14 |+14
5s=29 | :5
s=5,8
c) 17y+28=19y+27 |-17y
28=2y+27 |-27
2y=1 |:2
y= 0,5
d) 8k-19=-8k+19
8k + 8k = 19 + 19
16k = 38 | :16
k=2,375
Ostatnie trochę innym sposobem. ale chyba jest dobrze.