private boolean buildExpressionWithRestOfTheValues(int item, StringBuffer expression, int expectedTotal, ArrayList restOfValues, String operator) {
        StringBuffer newExpression = new StringBuffer();
        boolean isPossibleWithRestOfValues = find(restOfValues, expectedTotal, newExpression);
        if(isPossibleWithRestOfValues){
            expression.append("(").append(newExpression).append(operator).append(item).append(")");
            return true;
        }
        return false;
    }

Post after long time

Java