20+(−5)+(−5)+(−5)+(−5)=20+4(−5)=0

? ÷ ?

The expression "? ÷ ?" cannot be simplified without specific values for the variables.

To solve ? ÷ ?, we need the specific values for the numbers being divided. Please provide the values you have in mind, and I'll guide you through the steps to find the quotient.