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- The first grade mathematics circle plus triangle equals 15 circle minus triangle equals 1 circle.
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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