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9x = 5*4
9x=20 I:9
x = 2 2/9
____________________
b) x-2/3 = x/4
x- 1/4x = 2/3
3/4 x = 2/3 i8 4/3
x = 8/9
________________________ Powodzenia :)
5x = 36/5
x = 7 1/5