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x-25%*x = 279
x-0,25x = 279
0,75x = 279 |:0,75
x = 372 [zł]
=279 * 25/100=
=69,75
279-69,75= 209,25
x-0,25x = 279
0,75x = 279 |:0,75
x = 372 [zł]