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y - wiek mamy
4(x-4) = y-4
10(x-10) = y - 10
4x-16 = y-4
10x - 100 = y - 10
4x - y = 12 //*-1
10x - y = 90
-4x + y = -12
10x - y = 90
6x = 78 / 6
x = 13
autor wypowiedzi ma 13 lat