public List <Eq> split()
{
List <Eq> res = new List <Eq>();
res.Add(this);
if (this.operat == "")
{
;
}
else
{
if (operand1 != null)
{
if (operand1.split().Exists(x => (x.print().Equals("x") || x.print().Equals("y"))))
{
foreach (Eq x in operand1.split())
{
res.Add(x);
}
}
}
if (operand2 != null)
{
if (operand2.split().Exists(x => (x.print().Equals("x") || x.print().Equals("y"))))
{
foreach (Eq x in operand2.split())
{
res.Add(x);
}
}
}
}
return(res);
}
