Actually, I've found possible solution
//returns true
new BigDecimal("5.50").doubleValue() == new BigDecimal("5.5").doubleValue()
Of course, it can be improved with something like Math.abs (v1 - v2) < EPS to make the comparison more robust, but the question is whether this technique acceptable or is there a better solution?
If someone knows why java designers decided to implement BigDecimal's equals in that way, it would be interesting to read.