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3r+s=24
metoda podstawiania
s + s = 24
2s = 24 |:2
s = 12
3r = 2
3r = 12 |:3
r = 4
r=4
3r+s=24
3r=s
s+s=24
3r=s
2s=24 |:2
3r=s
s=12
r=12/3=4