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public virtual double MakePayment(double Summ)
{ 
            double remain = SummPlan - SummFact;
            remain = Summ - remain;
            remain = remain - SummFact;
            if (remain >= 0)
            {
                SummFact = SummPlan;
                return remain;
            }
            else
            {
                SummFact = Summ;
                return remain;
            }
}
                                    
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