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1+x - masa roztworu
8‰ *(1+x) = x
8 : 1000 + 8x : 1000 = x
8 : 1000 = 992x : 1000
8 = 992x
x = 1/124 kg
1+x - masa roztworu
8‰ *(1+x) = x
8/1000 + 8x/1000 = x
8/1000 = 992x/1000
8 = 992x
x = 1/124 kg
myślę że dobrze. ;)