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7% = 0,07
x + 0,07 x = 2675
1,07 x = 2675
x = 2675 : 1,07
x = 2500 -> kwota wpłacona do banku przez Panią Anię.
x+0.07x=2675zł
1,07x=2675 /1,07
x=2500zł