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0,7x + 0,7x * 0,3 = 273
0,91x = 273
x = 300
273-81.90= 191.10
x - 30% 191,1*0,30=57,33
------------ 191,1+57,33=248,43
100x=273*30
100x=8190/100
x = 81,9