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x-10%
x*130=91*10
x*130=910
x=910:130
x=7
odp:10% tej liczby to 7
91-130%
x-100%
x*130=91*100
x*130=9100
x=9100:130
x=70
odp:100% tej liczby to 70
1,3x=91
x=70
10%*70=70*0,1=7
100%*70 = 70