private void simplifyEquation(Boolean constBoolean, PsiExpression otherOperand) {
      if (constBoolean.booleanValue()) {
        resultExpression = otherOperand;
      }
      else {
        PsiPrefixExpression negated = createNegatedExpression(otherOperand);
        resultExpression = negated;
        visitPrefixExpression(negated);
      }
    }
private void simplifyEquation(Boolean constBoolean, PsiExpression otherOperand)