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x = 150 * 0,0625 + 0,0625x
0,9375x = 9,375
x = 9,375/0,9375 = 10
6,25g soli------93,75g wody (100g roztworu - 6,25g soli)
xg soli----------150g wody
x=10g soli
czyli:
x = 0.0625 (x + 150)
x = 0,0625 x + 9,375
0,9375 x = 9,375
x = 10