public class MathNegationTests : Linq3IntegrationTest
{
    [Fact]
    public void Math_negation()
    {
        var collection = CreateCollection();

        var query = collection.AsQueryable()
            .Where(i => -i.A == 10);

        var results = query.ToList();

        results.Should().OnlyContain(i => -i.A == 10);
    }

    private IMongoCollection<Data> CreateCollection()
    {
        var collection = GetCollection<Data>("test");
        CreateCollection(
            collection,
            new Data { A = -10 },
            new Data { A = 5 });
        return collection;
    }

    private class Data
    {
        public int A { get; set; }
    }
}