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6 * 9kr100=(x+6)*8kr100 mnożymy obu stronnie razy 100
100*6 *9kr100=(x+6)*8kr100*100
skracamy setki
54=(x+6)*8
54=8x+48
8x=54-48
8x=6/8
x=6kr8
x=3kr4
x=0,75-trzeba dodać 0,75kg wody