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0.05x- sól w solance
19-x - sol dosypana
(0,05x+19-x) /19 * 100 %= 8%
(0.05x+19-x)/ 19 *1= 0.08 / * 19
(0.05+19-x)= 0.08 * 19
0.05x+19-x=1.52
0.05x-x=1.52-19
-0.95x=-17,48/ :(-0.95)
x= 18.4