If (a + b) : (b + c) : (c + a) = 5 : 7 : 6, then what is the value of (a – b + c) : (a + b – c)? - CDS Elementary Mathematics 2024 (I)

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If (a + b) : (b + c) : (c + a) = 5 : 7 : 6, then what is the value of (a – b + c) : (a + b – c)?