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Althea has 100 trading cards and Marlon has 20. Every day Althea gives Marlon one card. Use the equations "c=100-d" and "c=20+d" to model this situation. Solve the system by substitution. Explain what the solution means in this situation.

User Shandell
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Answer: 5

Step-by-step explanation: 100/20=5

User Vikram Thakur
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