private void SumLeftCompatibles()
{
var newList = new List <Summand>();
while (LeftSide.Count > 0)
{
var instance = LeftSide.First();
LeftSide.RemoveAt(0);
var compatibles = LeftSide.Where(x => x.Compatible(instance)).ToArray();
foreach (var summand in compatibles)
{
instance = instance.Sum(summand);
LeftSide.Remove(summand);
}
newList.Add(instance);
}
newList.RemoveAll(x => Math.Abs(x.Multiplier) < Helper.Epsilon);
LeftSide = newList;
}