Answer:
1. SELECT VendorID, MAX(InvoiceTotal) AS InvoiceMax
FROM Invoices
WHERE InvoiceTotal - CreditTotal - PaymentTotal > 0
GROUP BY VendorID
2. SELECT SUM(InvoiceMax) AS SumOfMaximums
FROM (SELECT VendorID, MAX(InvoiceTotal) AS InvoiceMax
FROM Invoices
WHERE InvoiceTotal - CreditTotal - PaymentTotal > 0
GROUP BY VendorID) AS MaxInvoice
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