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x = 20 1/4 - 6 3/4= 19 25/20 - 6 16/20
x = 13 9/20
6 i 4/5 + ? = 20 i 1/4
6 i 16/20 + ? = 20 i 5/20
6 i 16/20 + 13 i 9/20= 20 i 5/20
Powinno być dobrze. ; ))
6 16/20+x=20 5/20
20 5/20 -6 16/20=x
x=20 5/20 -6 16/20
x=13 9/20