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mama 3x
syn x
3x+2+3x+x=93
7x+2=93
7x=91 |:7
x=13
tata 41
mama 39
syn 13
matka 3x
ojciec 3x+2
x+3x+3x+2=7x+2=93
7x=91
1x=13
syn-13lat
mama-39lat
tata-41
obliczenie
13x3=39+2=41