add a+b- ab, b+c- bc, c+a-ca
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3
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Answer:
2a+2b+2c-ab-bc-ca
Step-by-step explanation:
a + b - ab + b+c - bc + c+a - ca
= a+a+b+b+c+c -ab-bc-ca
= 2a+2b+2c-ab-bc-ca
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