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mama = x-2
syn = (x-2)/3
razem 93
tata = 41
mama=39
syn = 12
3x - wiek mamy 3*13=39
3x+2 - wiek taty 39+2=41
x+3x+3x+2=93
7x+2=93
7x=93-2
7x=91/:7
x=13