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Odp:ewa zebrała już 49 kalendarzyków .
Gdyby: x + 1/2x + 1 = 100
x + 1/2x + 1 = 100
1,5 (jeden i jedna druga x ) = 100-1
1,5 (jeden i jedna druga x ) = 99 / : 1,5
x = 66
Ma teraz 66 kalendarzyków