using uCalcSoftware;

var uc = new uCalc();
var t = uc.NewTransformer();
t.Text = "The value is: x";

uc.DefineVariable("VarX");
t.FromTo("x", "{@Eval: VarX}").uCalc.Eval("VarX = 123");

t.Transform();
Console.WriteLine(t.Text);