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-3k=7-15
-3k=-8 l· (-1)
3k=8 l: 3
k=8/3
k=2 i 2/3 (ukośnik / to inaczej kreska ułamkowa)
c) 1/2 · z = 27 l: 1/2
z= 27 :1/2
z= 27 · 2
z= 54
d) 2/3 ·s - 6 = 24
2/3 ·s= 24 + 6
2/3 · s= 30 l: 2/3
s= 30 · 3/2
s= 45