private Boolean IsCorrectAmountOfBrackets(String expression)
{
var isCorrectInputData = false;
var amountOfClosedBrackets = expression.Count(x => x == ')');
var amountOfOpenBrackets = expression.Count(x => x == '(');
if (amountOfClosedBrackets == amountOfOpenBrackets)
isCorrectInputData = true;
return isCorrectInputData;
}