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100% - x
6% - 9
kreska ułamkowa długa ;P
100 x 9 : 6
x = 150
100% -x
6%-9
x= 100%*9 / 6% (pocenty sią skracają)
x = 900 / 6
x= 150
6% - 9
6%x=9*100%
x=900:6
x=150