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x = 1,1 + x/1,1
x - x/1,1 = 1,1 / * 1,1
1,1x - x = 1,21
0,1x = 1,21 / * 10
x = 12,1
liczę na najlepsza odpowiedź :))
x+1,21=1,1x
0,1x=1,21
x=12,1