Odpowiedź:
j)
s - 9 = 6
s = 6 + 9
s = 15
Sprawdzenie:
15 - 9 = 6
6 = 6
L = P
k)
7 + x = 15
x = 15 - 7
x = 8
7 + 8 = 15
15 = 15
l)
k + 3 = 7
k = 7 - 3
k = 4
4 + 3 = 7
7 = 7
