Ответ:
1.
X+15%+X=2580
2x+15%=2580
2x=2193
x=1096.5
x+15%=1483.5
2. 2,5,3,6
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Ответ:
1.
X+15%+X=2580
2x+15%=2580
2x=2193
x=1096.5
x+15%=1483.5
2. 2,5,3,6