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I understood. The problem was in brackets.
Should be
result1 = ( (-getB() + sqrt(discr)) / (2.0*getA()) );
result2 = ( (-getB() - sqrt(discr)) / (2.0*getA()) );

With many other equations work, BUT with this one NOT.
Have no idea why )

Result shoud be -0.5 and -1/3(in double)
BUT console shows me -18.0 and -12.0

Here my class


package task1;