public Equation SolutionByVariable(string name)
{
Function f = new Function();
Function copy = this.Clone() as Function;
for (int i = 0; i < copy.variables.Count; i++)
{
var vs = copy.variables[i];
if (vs.HasVariable(name))
{
f += vs;
copy.variables.Remove(vs);
}
}
if (f.variables[0].Constant < 0)
{
f *= -1;
copy *= -1;
}
var temp = f.ReverseAllFunctionsTo(copy);
return new Equation(temp.Item1 as Function, temp.Item2 as Function);
}