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-3*k=7-15
-3*k=-8 /(-3)
k=
c) *z=27 /*2
z=54
d) *s-6=24
*s = 30 /*3
2s=90
s=45
-3k=-8/×(-1)
3k=8/÷3
k=2,6
c) 1/2×z=27/×2
z=54
d)2/3s-6=24/+6
2/3s=30/×3
2s=90/÷2
s=45