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x- ½x -(7/12)*½x =25 (bo 25 muszelek zostalo i on je zgubil)
x- ½x- (7/24)x = 25
x- (12/24)x - (7/24)x = 25
x -(19/24)x=25
(5/24)x =25
x= 25* (24/5)
x= 120 muszelek
odp. Karol miał początkowo 120 muszelek