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b) 36:3=12 12*3=36
c) 121-19=102. 102+19=121
d) 22*5=110. 110:5=22
e) nie wiem :/
x=21-13
x=8
b)
3x=36 /:3
x=12
c)
x=121+19
x=140
d)
1/5x=22 /*5
x=110
e)
2x=4+2
2x=6 /:2
x=3
LICZE NA NAJ! :)