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Kasia - 10 pudełek kredek
6x + 96 = 10x
96 = 10x - 6x
96 = 4x
24 = x
W każdym pudełku są 24 kredki
Spr.: Jola: 6 * 24 = 144
Kasia: 10 * 24 = 240
240 - 144 = 96