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The first grade mathematics circle plus triangle equals 15 circle minus triangle equals 1 circle.
〇+△= 15

〇-△= 1

Add these two formulas together.

〇+△+〇-△= 15+ 1

〇+〇= 16

〇+〇=8+8

〇=8

〇-△= 1

8-△= 1

△=7

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