Rozwązcie:
0,05x+o,8*0,95x+38=x
*- pomnozyc
0,05x+0,76x+38=x
38=x-0,81x
38=0,19x
x=200
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0,05x+0,76x+38=x
38=x-0,81x
38=0,19x
x=200